Hard-core Communists in Hollywood, and by that I mean those with party cards and whose allegiance was to Joseph Stalin and the Soviet Union, not the United States, made a major effort to take over the movie industry and nearly succeeded. The much-maligned House Un-American Activities Committee, as even liberal Hollywood historians Larry Ceplair and Steven Englund acknowledge, uncovered over 200 party members in Hollywood. My dad, Morrie Ryskind, one of the few outspoken anti-Communist screenwriters in Hollywood, said the number was closer to 300. They were part of a broad conspiracy of subversives who had penetrated America’s most critical...