In 1947, Menjou cooperated with the House Committee on Un-American Activities saying that Hollywood "is one of the main centers of Communist activity in America". He added: "it is the desire and wish of the masters of Moscow to use this medium for their purposes" which is "the overthrow of the American government". Menjou was a leading member of the Motion Picture Alliance for the Preservation of American Ideals, a group formed to oppose communist influence in Hollywood, whose other members included John Wayne, Barbara Stanwyck (with whom Menjou costarred in "Forbidden" in 1932 and "Golden Boy" in 1939) and her husband, actor Robert Taylor.