In the new edition of this definitive work on the history of the revolutionary socialist current in the United States that came to be identified as "American Trotskyism," Paul Le Blanc offers fresh reflections on this history for scholars and activists in the twenty-first century. Includes a preface written especially for the new edition of this distinctive work.Paul Le Blanc is a professor of History at La Roche College and author of Choice Award–winning book A Freedom Budget for All Americans.