A Threat of the First Magnitude: FBI Counterintelligence & Infiltration From the Communist Party to the Revolutionary Union â " 1962-1974 (Large Print - Paperbackby Aaron J. Leonard and Conor a. Gallagher (Author) Positioning statement: The untold story of the FBI informants who penetrated the upper reaches of organizations such as the Communist Party, USA, the Black Panther Party, the Revolutionary Union and other groups labeled threats to the internal security of the United States. Sales points: Tells the story of FBI informants in Communist groups in America in the 60s and 70s Uses newly released FBI