Writings, correspondence, notes, memoranda, clippings, other printed matter, and audiovisual material, relating to Marxism; the international communist movement; communism in the Soviet Union, the United States, and elsewhere; literature and art in the Soviet Union and in Mexico; and the Mexican artist Diego Rivera. Includes some papers of Rivera, and papers of Ella Wolfe, wife of B. D. Wolfe. Bertram D. Wolfe was an American historian; representative of the Communist Party, U.S.A., to the Communist International, 1928-1929; author of Three Who Made a Revolution (1948) and other works on communism.