History of American Trotskyism, 1928–38: Report of a Participant is a biographical book written by the Communist James P. Cannon,[1] founder and leader of the Socialist Workers Party. The book is based on twelve speeches given by Cannon in 1942 explaining about his expulsion from the Communist Party USA as a Trotskyist in 1928 and the efforts to build a new, non-Stalinist communist movement in the United States.