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I doubt a complete list will ever be possible, but the end of the cold war resulted in a lot of KGB files being opened.Soviet espionage in the United States - WikipediaSince the late 1920s, the Soviet Union, through its GRU, OGPU and NKVD intelligence services, used Russian and foreign-born nationals as well as Communist, and people of American origin to perform espionage activities in the United States.[1][2][3]These various espionage networks had contact with various U.S. government agencies, transmitting to Moscow information that would have been deemed confidential.[1][2][3]List of Eastern Bloc agents in the United States - WikipediaI am only listing Soviet Agents, the East Germans and others are on the site.NKVD and KGBNKVDMarion Davis Berdecio, friend of Judith Coplonand Flora Wovschin (stepdaughter of Enos Wicher) who all became involved in Soviet espionage at Columbia UniversityEngelbert Broda, Austrian physicist, a main Soviet source of information on UK and U.S. nuclear research; ex-wife married Alan Nunn May[1][2][3]Guy Burgess, recruited by Soviets at Cambridge; BBC producer; colleague of Kim Philby at UK embassy in D.C. before fleeing with Donald Maclean to USSR; led to major breach in "Special Relationship";[4] died in MoscowBoris Bukov, head of apparatus connected to Whittaker Chambers and Alger Hiss.Samuel Dickstein (congressman), paid informant for Soviet NKVDFrederick Vanderbilt Field, scion of wealthy family, president of The Harvard Crimson,defended Great Purge stating "... because Comrade Stalin says so, we have to believe the trials are just. He has never let us down."[5]Isaac Folkoff, senior founding member of the California Communist Party and West Coast liaison between Soviet intelligence and the Communist Party USA (CPUSA)[6][7]Grigory Kheifets, San Francisco NKVD station chief or Rezident[8][9]George Koval, Iowa-born agent got Hero of Russia award from Putin for Manhattan Projectinfiltration that "drastically reduced the amount of time it took for Russia to develop nuclear weapons"; died in Moscow[10][11][12][13]Samuel Krafsur, TASS reporter who was mentioned prominently in the Venona filesWalter Krivitsky, close friend of Ignace Reiss; defected to U.S. to escape Great Purge, associate of Chambers, shot dead in D.C.Rudy Lambert, head of California Communist Party, figured prominently in AEC revocation of Oppenheimer's security clearance[7]Maxim Lieber, prominent NYC agent named by Chambers; pled the Fifth, fled to Mexico, PolandLudwig Lore, socialist journalist for New Yorker Volkszeitung and the New York Post; recruited agents and gave info to SovietsDonald Maclean, joined Soviet NKVD at Cambridge, diplomat for UK in D.C., main source of info about U.S. energy policy that helped USSR evaluate nuclear arsenal, died in MoscowAlan Nunn May, UK physicist, contemporary of Maclean at Cambridge; confessed to giving Manhattan Project secrets to USSR which led to McMahon Act restricting sharing with UK; served 6½ of 10-year hard-labor sentence[14][15]Isaiah Oggins, friend of Whittaker Chambers at Columbia; NKVD agent then accused of "treason" by Soviets and summarily executed by StalinAlexander Orlov, NKVD rezident in Republican government during Spanish Civil War, defected to U.S. to escape Stalin's Great PurgeKim Philby, OBE, recruited by USSR at Cambridge, UK intelligence rep in D.C. where he covered for Guy Burgess at UK embassy; won Order of Lenin, died in MoscowJuliet Poyntz, taught at Columbia, co-founded Communist Party USA, visited Moscow during Stalin's Great Purge, returned disillusioned, disappeared in NYCVladimir Pravdin, a.k.a. Roland Lyudvigovich Abbiate, UK-born senior NKVD assassin during Great Purge, killed defector Ignace Reiss; stationed in U.S. as head of TASS news agency; contacts included Judith Coplon and Joseph KatzFred Rose (politician), Canadian Member of Parliament, led Soviet spies targeting Manhattan Project exposed by Igor Gouzenko's defection; died in PolandDavid A. Salmon, operative in State Dept. and War Dept.Marion Schultz, asset of the New York NKVDworking within immigrant community during World War 2Pavel Sudoplatov, top Soviet spy who accused Oppenheimer[16]William Weisband, U.S. Army signals intelligence staffer and NKVD agent handlerKGBAldrich Ames, CIA officer, started spying for USSR as walk-in to old Soviet embassy in D.C., sentenced to lifeFelix Bloch, U.S. State Dept. economic officer; Soviets were warned about U.S. investigation into his activities by Robert Hanssen[17][18]David Sheldon Boone, signals Intelligenceanalyst at NSA, sentenced to 24 years for selling info to USSRChristopher John Boyce, one of 2 walk-in spies for USSR known as the Falcon and the Snowman, sentenced to 40 years before escape, then 28 moreJames Hall III, served 22 of 40-year sentence for espionage committed at NSA station in GermanyRobert P. Hanssen, FBI agent given 15 consecutive life sentences; betrayed existence of tunnel under Soviet embassy in D.C.; may have done most damage since Kim Philby of Cambridge FiveReino Häyhänen, Finn who spied in U.S. handled by Rudolf Abel, used the VIC cipher, defected to U.S.[19]Clarence Hiskey, CPUSA member whose association with J. Robert Oppenheimercontributed to loss of security clearance[20]Edward Lee Howard, ex-CIA officer who sold info, subtitled book The Only CIA Operative To Seek Asylum In RussiaDaulton Lee, one of 2 walk-in spies for USSRknown as the Falcon and the Snowman, sentenced to lifeClayton J. Lonetree, U.S. Marine, Moscow embassy guard suborned by female KGB agent; sentenced to lifeJames Walter Miller, one of Isaac Folkoff's most valuable assets at San Francisco KGB as government censorHarold James Nicholson, former CIA officer twice convicted of espionage, sentenced to total of 33½ years in Florence supermax prisonRonald Pelton, NSA analyst, walk-in to old Soviet embassy in D.C., sentenced to 3 concurrent life termsEarl Edwin Pitts, former FBI special agent arrested at FBI Academy in Quantico, Va., sentenced to 27 yearsNorman J. Rees, oil engineer, Soviet agent, then double agent for FBI; committed suicide after exposure by newspaper[21]George Trofimoff, most senior U.S. military officer ever charged with espionage, sentenced to lifeArthur Walker, brother of John Walker, sentenced to 3 life terms + 40 yearsJohn Anthony Walker, U.S. Navy senior enlisted man, spied for USSR for decades, recruited family and friends, sentenced to 3 life termsMichael Walker, son of John Walker, sentenced to lifeJoseph Weinberg, KGB contact for Byron Darling; student of J. Robert Oppenheimer at Berkeley[22][23]Jerry Whitworth, sentenced to 365 years for role in Walker spy ring,[24] said to be "most damaging espionage ring uncovered in the U.S. in 3 decades."[25]Buben groupLouis F. Budenz, Central Committee of Communist Party USA, editor of Daily Worker, professor at Fordham, then renounced communismRobert Menaker, operative whose father was imprisoned as a Russian revolutionary and whose niece married Victor PerloSalmond Franklin, a communications "signaler" (sviazist), married Sylvia Callen, worked with Morris Cohen and Milton WolffSylvia Caldwell, technical secretary for a Trotskyist group in NYCLona Cohen, served 8 of 20-year sentence; died in Moscow; subject of Hugh Whitemore's drama for stage and TV Pack of LiesMorris Cohen, served 8 of 25-year sentence; died in Moscow; subject of Hugh Whitemore's drama for stage and TV Pack of LiesJudith Coplon, NKGB counter-intelligence operative in U.S. Justice Dept.; two convictions overturned on Constitutional technicalitiesEugene Dennis, senior member of Communist Party USA leadership, sentenced to 5 years for advocating overthrow of U.S. governmentDieter Gerhardt, South African Navycommodore who was convicted of spying for USSR; alleged that Vela Incident was a joint Israeli–South African nuclear testTheodore Hall, physicist who supplied high-level info from Los Alamos during Manhattan Project, a NYC walk-in, never prosecuted, fled to Cambridge, UK where he admitted guilt in media interviews[26]Clarence Hiskey, CPUSA member whose association with J. Robert Oppenheimer led to loss of security clearanceMocaseBoris Morros, Hollywood producerJack Soble, sentenced to 7 years, brother of Robert SoblenMyra Soble, sentenced to 5½ yearsRobert Soblen, sentenced to life for spying at Sandia Lab, etc., but escaped to Israel, then committed suicideJane Foster Zlatovski, allegedly became member (with husband) of a Soviet espionage ring run by Jack Soble[27]Mark Zborowski, NKVD's most valuable mole inside the Trotskyist organization in Paris and NYC; served 47-month sentence for perjury[28]Perlo groupVictor Perlo, joined Communist Party USA at Columbia, then joined series of gov't agencies including U.S. Treasury Dept.; Brookings InstitutionHarold Glasser, Director, Division of Monetary Research, U.S. Treasury Dept.; United Nations Relief and Rehabilitation Administration(UNRRA); War Production Board; Adviser on North African Affairs Committee; U.S. Treasury Representative to the Allied High Commission in ItalyAlger Hiss, Director of the Office of Special Political Affairs, U.S. State Dept., served 3½ years for perjuryCharles Kramer, Senate Subcommittee on War Mobilization; Office of Price Administration; National Labor Relations Board; Senate Subcommittee on Wartime Health and Education; Agricultural Adjustment Administration; Senate Subcommittee on Civil Liberties; Senate Labor and Public Welfare Committee; Democratic National Committee(DNC)Harry Magdoff, Statistical Division of War Production Board and Office of Emergency Management; Bureau of Research and Statistics, Works Progress Administration; Tools Division, War Production Board; Bureau of Foreign and Domestic Commerce, U.S. Commerce Dept.Allen Rosenberg, Board of Economic Warfare; Chief of the Economic Institution Staff, Foreign Economic Administration; Senate Subcommittee on Civil Liberties; Senate Committee on Education and Labor; Railroad Retirement Board; Counsel to the Secretary of the NLRBRedhead groupHedwiga Gompertz, Wacek's wife, sent to U.S. to carry out fieldwork assignments, defected in 1948Paul Massing, scientist at the Institute for Social Research (the "Frankfurt School") at Columbia UniversityLaurence Duggan, former employee of U.S. State Dept., suicideRudolf Roessler chief of Lucy spy ring of World War 2Rosenberg ringJoel Barr, met Julius Rosenberg at City College of New York (CCNY), later spied with him and Al Sarant at Army Signal Corps lab in New Jersey; escaped prosecution by fleeing to Soviet blocAbraham Brothman, served 2 years for conspiring to obstruct justice along with Miriam Moskowitz; Brothman gave secret info to Elizabeth Bentley who turned it over to USSR[29][30]Klaus Fuchs, physicist who supplied info on UK and U.S. atomic bomb research to USSR; served 9 of 14-year sentence in UK; died in East GermanyVivian Glassman, fiancée of Joel Barr[31]Harry Gold, courier sentenced to 30 yearsDavid Greenglass, draftsman at Los Alamos in World War II, gave atomic bomb documents to his sister Ethel Rosenberg; sentenced to 15 yearsRuth Greenglass, escaped prosecution in exchange for her husband's testimony against his sister and brother-in-law, the RosenbergsMiriam Moskowitz, convicted of obstruction of justice for helping Harry Gold; served 2 years in prison,[32][33][34] convicted on testimony of Harry Gold and Elizabeth Bentley[35]William Perl, active in Young Communist Leagueat CCNY, then met Al Sarant at Columbia; served 5 years for perjuryMorton Sobell, involved with Barr, Perl and Julius Rosenberg at CCNY; sentenced to 30 years at AlcatrazEthel Rosenberg, executed at Sing Sing prison for conspiracy to commit espionageJulius Rosenberg, executed at Sing Sing prison for conspiracy to commit espionageAl Sarant, stole radar secrets at Army Signal Corps lab in New Jersey, then he and his mistress abandoned their families for Soviet blocAndrew Roth, ONI liaison officer with U.S. State Dept.Saville Sax, friend of Theodore Hall at Harvard, assisted with Hall's giveaway of atomic bombsecrets from Los Alamos to Soviet mission in NYC[36][37]Silvermaster groupNathan Gregory Silvermaster, Chief Planning Technician, Procurement Division, U.S. Treasury Dept.; Chief Economist, War Assets Administration; Director of the Labor Division, Farm Security Administration; Board of Economic Warfare; Reconstruction Finance Corporation, U.S. Commerce Dept.Helen Silvermaster (wife)Solomon Adler, U.S. Treasury Dept. official with Harry Dexter White; returned to his native UK to teach at Cambridge; joined Mao's government; died in ChinaNorman Chandler Bursler, Justice Dept. Antitrust Division[38][39]Frank Coe, associate of Harry Dexter White and Solomon Adler, named by Whittaker Chambersand Elizabeth Bentley as a source of information for Silvermaster and Ware Group; Coe took the Fifth many times; later joined Mao's government for the Great Leap Forward, died in red ChinaLauchlin Currie, Administrative Assistant to FDR; Deputy Administrator of Foreign Economic Administration; Special Representative to ChinaBela Gold, Assistant Head of Program Surveys, Bureau of Agricultural Economics, USDA; Senate Subcommittee on War Mobilization; Office of Economic Programs in Foreign Economic AdministrationSonia Steinman Gold, Division of Monetary Research, U.S. Treasury Dept.; U.S. House of Representatives Select Committee on Interstate Migration; U.S. Bureau of Employment SecurityIrving Kaplan, Foreign Funds Control and Division of Monetary Research, U.S. Treasury Dept., Foreign Economic Administration; chief adviser to the Occupation Government in GermanyGeorge Silverman, civilian Chief Production Specialist, Material Division, U.S. Army Air Forces Air Staff, Department of War, PentagonWilliam Henry Taylor, Assistant Director of the Middle East Division of Monetary Research, U.S. Treasury Dept.William Ullman, delegate to United Nations Charter meeting and Bretton Woods conference; Division of Monetary Research, U.S. Treasury Dept.; Material and Services Division, Air Corps Headquarters, PentagonAnatole Volkov, courier for the Silvermaster groupHarry Dexter White, U.S. Treasury official, collaborated with Solomon Adler, Frank Coe and Harold Glasser on failed loan program for Nationalist government of China;[40] head of IMF which he helped create along with UN and World Bank[41][42]Sound and Myrna groupsSolomon Adler, U.S. Treasury Dept. official with Harry Dexter White;[43] returned to his native UK to teach at Cambridge; joined Mao's government; died in ChinaCedric Belfrage, journalist; referenced as a Soviet agent in Venona project, although he may have been working as a double-agent for British Security CoordinationElizabeth Bentley courier messenger for Communist spy rings on the East Coast, testified about her activities in hearingsFrank Coe, Assistant Director, Division of Monetary Research, U.S. Treasury Dept.; Special Assistant to the U.S. Ambassador in London; Assistant to the Executive Director, Board of Economic Warfare; Assistant Administrator, Foreign Economic AdministrationLauchlin Currie, Administrative Assistant to President Roosevelt; Deputy Administrator of Foreign Economic Administration; Special Representative to ChinaRae Elson, courier of Communist Party USAunderground, was chosen by Joseph Katz to replace Elizabeth Bentley at the Soviet front organization, U.S. Shipping & Service Corp.Edward Fitzgerald, War Production BoardCharles Flato, Board of Economic Warfare; Civil Liberties Subcommittee, Senate Committee on Education and LaborBela Gold, Bureau of Intelligence, Assistant Head of Program Surveys, Bureau of Agricultural Economics, USDA; Senate Subcommittee on War Mobilization; Office of Economic Programs in Foreign Economic AdministrationSonia Steinman Gold, Division of Monetary Research, U.S. Treasury Dept.; U.S. House of Representatives Select Committee on Interstate Migration; U.S. Bureau of Employment SecurityIrving Goldman, Office of the Coordinator of Inter-American AffairsJacob Golos, "main pillar" of the NKVDintelligence network in U.S., died in the arms of Elizabeth BentleyGerald Graze, United States Civil Service Commission; Dept. of Defense, U.S. NavyofficialMaurice Halperin, Chief of Latin American Division, Research and Analysis section, OSS; U.S. State Dept.Julius Joseph, Far Eastern section (Japanese Intelligence) OSSIrving Kaplan, U.S. Treasury Dept. Foreign Economic Administration; UN Division of Economic Stability and Development; Chief Adviser to the Military Government of GermanyJoseph Katz, part of NKGB mission recruiting members of Communist Party USA.Duncan Lee, counsel to General William Donovan, head of OSSHelen Lowry, Soviet citizen born and raised in U.S., niece of Earl Browder; wife of Iskhak AkhmerovHarry Magdoff, Chief of the Control Records Section of War Production Board and Office of Emergency Management; Bureau of Research and Statistics, Works Progress Administration; Tools Division, War Production Board; Bureau of Foreign and Domestic Commerce, U.S. Commerce Dept.; Statistics Division WPAJenny Levy Miller, Chinese Government Purchasing CommissionRobert Miller, Office of the Coordinator of Inter-American Affairs; Near Eastern Division, State Dept.Willard Park, Assistant Chief of the Economic Analysis Section, Office of the Coordinator of Inter-American Affairs; United Nations Relief and Rehabilitation AdministrationVictor Perlo, chief of the Aviation Section of the War Production Board; head of branch in Research Section, Office of Price Administration, Dept. of Commerce; Division of Monetary Research, U.S. Treasury Dept.; Brookings Institution, head of Perlo groupMary Price, stenographer for Walter Lippmannof the New York HeraldWilliam Remington, War Production Board; Office of Emergency Management, convicted for perjury, killed in prisonRuth Rivkin, United Nations Relief and Rehabilitation Administration, a source for Golos-Bentley network of spiesAllan Rosenberg, Board of Economic Warfare; Chief of the Economic Institution Staff, Foreign Economic Administration; Civil Liberties Subcommittee, Senate Committee on Education and Labor; Railroad Retirement Board; Counsel to the Secretary of the NLRBBernard Schuster[44]Greg Silvermaster, Chief Planning Technician, Procurement Division, U.S. Treasury Dept.; Chief Economist, War Assets Administration; Director of the Labor Division, Farm Security Administration; Board of Economic Warfare; Reconstruction Finance Corporation, U.S. Commerce Dept.John Spivak, journalist, exposé in the New Masses charged McCormack-DicksteinCommittee with suppressing evidence in Business Plot hearingsWilliam Taylor, Assistant Director of Monetary Research, U.S. Treasury Dept.Helen Tenney, OSSLud Ullman, delegate to United Nations Chartermeeting and Bretton Woods conference; Division of Monetary Research, U.S. Treasury Dept.; Material and Services Division, U.S. Army Air Corps Headquarters, PentagonDavid Weintraub, U.S. State Dept.; head of the Office of Foreign Relief and Rehabilitation Operations; United Nations Relief and Rehabilitation Administration (UNRRA); United Nations Division of Economic Stability and DevelopmentDonald Wheeler, OSS Research and Analysis divisionAnatoly Gorsky, (Anatoly Veniaminovich Gorsky, A. V. Gorsky), "Vadim", former rezident of the MGB USSR in WashingtonOlga Pravdina, former employee of the Ministry of Trade, wife of "Sergei," the rezident in New York; author of Gorsky Memo (see Vladimir Pravdin)[45]Vladimir Pravdin, "Sergei", TASS, former rezident of the MGB USSR in New YorkMikhail A. Shaliapin [Shalyapin], "Stock" ["Shtok"][46]Gaik Badelovich Ovakimian, former rezident of the MGB USSR in New YorkIskhak Abdulovich Akhmerov, "Albert" – former Illegal Rezident of the MGB USSR in New YorkMichael Straight, speechwriter for FDRWare groupWhittaker Chambers, U.S. State Dept., testified against Alger HissHenry Collins, NRA; USDAJohn Herrmann, Communist Party USAoperative and courier, eventually drank himself to death in Jalisco, MexicoAlger Hiss, U.S. State Dept., sentenced to 5 years for perjuryDonald Hiss, U.S. State Dept., younger brother of Alger HissVictor Perlo, became spymaster of Perlo groupduring World War 2George Silverman, Harvard-educated statistician who gave secret Pentagondocuments to Nathan Silvermaster group during World War IIHarry Dexter White, Assistant Secretary of the Treasury, head of the IMF which he helped establish along with the World Bank; highest placed Soviet asset in U.S. government[47]Bill Weisband, U.S. Army Signals Security AgencyNathaniel Weyl, joined Communist Party USAwith Perlo at Columbia, confessed to espionage in Senate hearingsEnos Wicher, professor at Columbia Universitywho also worked at Columbia's Division of War Research; stepfather of Columbia recruiter and State Department spy Flora WovschinThe "Berg" – "Art" GroupAlexander Koral, former engineer of municipality of NYCHelen Koral, Koral's wife, housewifeByron T. Darling, engineer for Rubber Co.[48]A. A. Yatskov, General Consul of the Consulate-General of the USSR's delegation in NYC in 1940sGeorge Blake, UK SIS officer who betrayed existence of Berlin Tunnel under Soviet sector and who probably betrayed PopovKGB IllegalsRudolf Abel, a.k.a. William Fischer, IllegalRezident in the 1950sIskhak Akhmerov, MGB, OGPU/NKVD in NYC; recruited agents in U.S. State Dept., U.S. Treasury, and U.S. intelligence services; chief illegal rezident in U.S.; agents he ran include Laurence Duggan, Mary Price, and Michael Straight; husband of Helen LowryBoris Bazarov, OGPU (Soviet secret police) official who served as the chief Illegal Rezidentin NYC; group included Iskhak Akhmerov and Helen Lowry; shot after Great PurgeGRU (Soviet military intelligence)Karl groupNoel Field, entered State Dept. from Harvard, associate of Paul Massing, exposed by Whittaker Chambers testimony, arrested and tortured 5 years on Soviet orders, died in HungaryHarold Glasser, Director, Division of Monetary Research, U.S. Treasury Dept.; United Nations Relief and Rehabilitation Administration; War Production Board; Adviser on North African Affairs Committee; U.S. Treasury Representative to the Allied High Commission in ItalyAlger Hiss, U.S. State Dept.; sentenced to 5 years for perjuryDonald Hiss, State Dept.; Labor Dept.; Interior Dept., convicted of perjuryVictor Perlo, chief of the Aviation Section of the War Production Board; head of branch in Research Section, Office of Price Administration, Commerce Dept.; Division of Monetary Research, U.S. Treasury Dept.; Brookings Institution, head of Perlo groupJ. Peters, a.k.a. Sándor Goldberger, leading figure of the Hungarian language section of the Communist Party USA in the 1920s and 1930s.William Ward Pigman, National Bureau of Standards; Labor and Public Welfare CommitteeVincent Reno, mathematician at U.S. Army's Aberdeen Proving GroundGeorge Silverman, Director of the Bureau of Research and Information Services, U.S. Railroad Retirement Board; Economic Adviser and Chief of Analysis and Plans, Assistant Chief of Air Staff, Material and Services, War Dept.Julian Wadleigh, U.S. State Dept., passed documents to Soviets via Whittaker Chambersin D.C.Harry Dexter White, Assistant Secretary of the Treasury with Solomon Adler and Frank Coe, head of IMF; considered highest USSR agent in U.S. gov'tViktor Vasilevish Sveshchnikov, U.S. War Dept.Portland ringMorris Cohen (Soviet spy) served 8 of 25-year sentence, then exchanged; subject of Hugh Whitemore's drama for stage and TV Pack of Lies; died in MoscowLona Cohen, served 8 of 20-year sentence, then exchanged; subject of Hugh Whitemore's drama for stage and TV Pack of Lies; died in MoscowEthel Gee, Houghton's accomplice, served 9 of 15-year sentenceHarry Houghton, passed British naval testing secrets from Isle of Portland, UK; served 9 of 15-year sentenceKonon Molody (a.k.a. Gordon Lonsdale), served 3 of 25-year sentence, then exchanged for a prisoner from USSRSorge ringChen Han-seng, spied for Moscow, mistreated in native China during Cultural RevolutionHotsumi Ozaki, journalist, only Japanese person hanged for treason during WW2Agnes Smedley, journalist, friend of Richard SorgeLydia Stahl, photographer, sentenced to 4 years in FranceJoseph Benjamin Stenbuck, leading Manhattan surgeon, accused of being a dead dropIrving Charles Velson, Brooklyn Navy Yard; American Labor Party candidate for New York State SenateFlora Wovschin, NKVD operative in U.S. State Dept., stepdaughter of Enos Wicher, friend of Marion Davis Berdecio and Judith Coplon from ColumbiaVasily Zarubin, husband of Elizabeth ZubilinElizabeth Zubilin, recruiter in U.S. of whom Pavel Sudoplatov, head of NKVD Fourth Directorate said, "In developing J. Robert Oppenheimer as a source, Elizabeth Zubilin was essential."Naval GRUJack Fahy, Naval GRU, Office of the Coordinator of Inter-American Affairs; Board of Economic Warfare; U.S. Interior Dept., targeted by Dies CommitteeEdna Patterson, Naval GRU, Soviet citizen born in Australia, operated in U.S. 13 yearsGRU IllegalsMoishe Stern, gained fame under his nom de guerre as General Kléber of International Brigade during Spanish Civil War.Alfred Tilton, Latvian head of GRU in U.S., arrested by Soviets during Great Purge, sentenced to 15 years, died in GulagAlexander Ulanovsky, a.k.a. Bill Berman, Felik, Long Man, Nathan Sherman, chief Illegalrezident for GRU in U.S., then prisoner in Soviet Gulag with his familyIgnacy Witczak, GRU Illegal officer in U.S. during World War 2[49]OthersArthur Adams, Swedish-born Hero of Russia, gave Manhattan Project info to USSR, died in MoscowArvid Jacobson, Detroit teacher vetted by Whittaker Chambers, sentenced to 6 years in Finland, returned to U.S.George Koval, previously unknown Soviet agent whose infiltration of Manhattan Project"drastically reduced the amount of time it took for Russia to develop nuclear weapons";[10]posthumously honored by Putin[50]Irving Lerner, GRU agent handled by Arthur Adams, caught spying at Berkeley[citation needed]Alexander Orlov, a.k.a. Leiba Lazarevich Feldbin, NKVD rezident in Republican government during Spanish Civil War, defected to U.S.Milton Schwartz, American who spied for Soviet military intelligence (GFinally the Venona project - WikipediaThe Venona project was a United States counterintelligence program initiated during World War II by the United States Army's Signal Intelligence Service (later absorbed by the National Security Agency), which ran from February 1, 1943, until October 1, 1980.[1]It was intended to decrypt messages transmitted by the intelligence agencies of the Soviet Union (e.g. the NKVD, the KGB, and the GRU).[2]Initiated when the Soviet Union was an ally of the US, the program continued during the Cold War, when it was considered an enemy.During the 37-year duration of the Venona project, the Signal Intelligence Service decrypted and translated approximately 3,000 messages.[3]The signals intelligence yield included discovery of the Cambridge Five espionage ring in the United Kingdom[4] and Soviet espionage of the Manhattan Project in the U.S.[5](known as project Enormous / операция «Энормоз»). The espionage was undertaken to support the Soviet atomic bomb project. The Venona project remained secret for more than 15 years after it concluded. Some of the decoded Soviet messages were not declassified and published by the United States until 1995.If you had the idea Soviet espionage in the USA was “small scale” I hope this clears that misimpression up.