Aaron Leonard is a writer and historian. He is author of Heavy Radicals: The FBI’s Secret War on America’s Maoists (Zero Books, 2015), and is currently completing A Threat of the First Magnitude—FBI Counterintelligence & Infiltration: From the Communist Party to the Revolutionary Union—1962-1974, (Repeater Books, UK, January 2018). He has been a regular contributor to Truthout, Rabble.ca, the History News Network, PhysicsWorld, and Canadian Dimension magazine. His research interests focus on twentieth century US history, particularly Sixties history and the repressive elements in play in that period. He has a B.A. in Social Science with a concentration in History, magna cum laude, from New York University. He lives in Brooklyn, New York.