Aaron J. Leonard is a writer and historian with a particular focus on the history of radicalism and state suppression. He is the author of Heavy Radicals: The FBI’s Secret War on America’s Maoists, A Threat of the First Magnitude—FBI Counterintelligence & Infiltration: From the Communist Party to the Revolutionary Union, and The Folk Singers and the Bureau: The FBI, the Folk Artists and the Suppression of the Communist Party, USA-1939-1956. He lives in Los Angeles.