U.S. Trotskyism 1928-1965. Part I: Emergence -- Left Opposition in the United States is the first of a documentary trilogy on a revolutionary socialist split-off from the U.S. Communist Party, reflecting Leon Trotsky’s confrontation with Stalinism in the global Communist movement. Spanning 1928 to 1940, this volume surveys important U.S. labor struggles in the 1930s, early efforts to comprehend the so-called “Negro Question,” and substantial contributions to the study history and the development of Marxist theory. Also covered are confrontations and convergences with other currents on the Left, internal debates and splits among Trotskyists themselves, and repressive efforts by the U.S. government in the first Smith Act Trial. Scholars and activists will find much of interest in these primary sources.