Bolshevism on Trial is a 1919 American silent propaganda film made by the Mayflower Photoplay Company and distributed through Lewis J. Selznick's Select Pictures Corporation. Directed by Harley Knoles from a screenplay by Harry Chandlee, it is based on the 1909 novel Comrades: A Story of Social Adventure in California by Thomas Dixon, author of the novels The Clansman: A Historical Romance of the Ku Klux Klan and The Leopard's Spots that served as the basis for The Birth of a Nation. It premiered in April 1919 during the First Red Scare.