https://en.wikipedia.org/wiki/John_Brennan_(CIA_officer)#Education
Controlled by the Soviet Union for most of its history
Engaged in espionage, infiltrated unions, and used front groups
Acted as a fifth column in American government and society
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"During the Cold War the CPUSA [Communist Party, USA] had a parallel underground structure, and a small number of people spied for Moscow.
Until the 1980s the party was receiving substantial amounts of Soviet funding, says Klehr, money that the FBI knew about and tracked."