D. J. Mulloy is Chair and Professor of History at Wilfrid Laurier University, where he specializes in the study of post-1945 U.S. history. He is the author of American Extremism: History, Politics and the Militia Movement (2004), The World of the John Birch Society: Conspiracy, Conservatism and the Cold War (2014) and Enemies of the State: The Radical Right in America from FDR to Trump.