Ronald Reagan (1911-2004) was a Hollywood actor turned politician, who served as governor of California from 1967 to 1975 and as the 40th President of the United States from 1981 to 1989. A Roosevelt Democrat in his younger days, Reagan converted to conservatism during the 1950s and became the beloved standard-bearer of the Republican Party in the late twentieth century.
During the late 1940s, Reagan served as the head of Hollywood's actors' union, the Screen Actors Guild. In his union capacity, Reagan volunteered to serve the FBI as a secret informant against Communists in the entertainment industry. He testified against the Hollywood Ten before the House Un-American Activities Committee.