In October 1964, Ronald Reagan gave a televised speech in support of Republican presidential nominee Barry Goldwater. "The Speech," as it has come to be known, helped launch Ronald Reagan as a leading force in the American conservative movement. However, less than twenty years earlier, Reagan was a prominent Hollywood liberal, the president of the Screen Actors Guild, and a fervent supporter of FDR and Harry Truman. While many agree that Reagan's anticommunism grew out of his experiences with the Hollywood communists of the late 1940s, the origins of his conservative ideology have remained...