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'''Isaac Folkoff''' was a senior members of the California [[Communist Party]] and West Coast liaison between Soviet intelligence and the Communist Party of the United States of America ([[CPUSA]]).  Folkoff was in charge of West Coast operations. Folkoff worked as a courier passing information to and from Soviet sources, and as a talent spotter and vetter of potential espionage recruits.  He also worked as a case officer.  His code name in Soviet intelligence and in the [[Venona]] files was "Uncle".

'''Isaac Folkoff''' was a senior member of the California [[Communist Party]] and West Coast liaison between Soviet intelligence and the Communist Party of the United States of America ([[CPUSA]]).  Folkoff was in charge of West Coast operations. Folkoff worked as a courier passing information to and from Soviet sources, and as a talent spotter and vetter of potential espionage recruits.  He also worked as a case officer.  His code name in Soviet intelligence and in the [[Venona]] files was "Uncle".

Folkoff collected CPUSA dues from [[J. Robert Oppenheimer]] who had been an ardent [[Popular Front]] liberal and ally.  Folkoff collected 150 dollars a month from Oppenheimer. <ref>Jerrold L. Schecter and Leona Schecter, ''Sacred Secrets: How Soviet Intelligence Operations Changed American History'' (Washington, DC: Brassey’s, 2002) FBI document attesting to that in Appendix 1. </ref>  As director of the [[Manhattan Project]] Oppenheimer knew all the secrets, and just as soon as new secrets came into being.  Up to the time Oppenheimer reported his contact with [[Haakon Chevalier]], he may have overlooked the conduct of others, a passivity motivated by personal and political ties. <ref>John Earl Haynes and Harvey Klehr, ''Venona: Decoding Soviet Espionage in America,'' Yale University Press, 1999, pp. 327-330.</ref> Another theory states Chevalier's approach To Oppenheimer may not have been an attempt at recruitment, but part of the big shake up after [[Stalin]] publicly disbanded the [[Comintern]] in 1943, and agents had to be reassigned new case officers.  Oppenheimer is mentioned in a KGB communication:  

Folkoff collected CPUSA dues from [[J. Robert Oppenheimer]] who had been an ardent [[Popular Front]] liberal and ally.  Folkoff collected 150 dollars a month from Oppenheimer. <ref>Jerrold L. Schecter and Leona Schecter, ''Sacred Secrets: How Soviet Intelligence Operations Changed American History'' (Washington, DC: Brassey’s, 2002) FBI document attesting to that in Appendix 1. </ref>  As director of the [[Manhattan Project]] Oppenheimer knew all the secrets, and just as soon as new secrets came into being.  Up to the time Oppenheimer reported his contact with [[Haakon Chevalier]], he may have overlooked the conduct of others, a passivity motivated by personal and political ties. <ref>John Earl Haynes and Harvey Klehr, ''Venona: Decoding Soviet Espionage in America,'' Yale University Press, 1999, pp. 327-330.</ref> Another theory states Chevalier's approach To Oppenheimer may not have been an attempt at recruitment, but part of the big shake up after [[Stalin]] publicly disbanded the [[Comintern]] in 1943, and agents had to be reassigned new case officers.  Oppenheimer is mentioned in a KGB communication: