The Emil J. Gumbel Collection preserves all of the Heidelberg professor's scrapbooks, manuscripts, research reports, articles, and pamphlets from 1916 to 1952. The collection documents the right-wing persecution of Gumbel and other critics of German militarism in the 1920s and chronicles the social and political conditions that fostered nationalism and spawned Nazism. The collection also includes research reports prepared by Gumbel on the Nazis for the Office of Strategic Services after fleeing to the U.S. Here is a fresh source for students of modern German history, including the history of the Weimar Republic, right-wing movements, and early Nazism. The collection will also interest researchers studying anti-Semitism, 20th-century left-wing intellectual history, and the pacifist movement during the First World War.