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 and A Threat of the First Magnitude—FBI Counterintelligence and Infiltration: From the Communist Party to the Revolutionary Union. He lives in Los Angeles. His most recent work, The Folk Singers and the Bureau: The FBI, the Folk Artists and the Suppression of the Communist Party, USA, 1939-1956, is now available from Repeater Books.