Given that most of Hollywood today leans distinctly Democratic, I found this 1944 article from Time Magazine to be quite interesting, in terms of getting an idea of where the Hollywood players of the time stood on the political spectrum.
The article also brought forth a letter of response from Orson Welles, which Time published a few weeks later. In his letter, Welles notes that while he and other Hollywood types were ripe targets for satire, the political content of the films Hollywood was making were a serious matter.
Of course, 25 years later, in his own magnum opus, The Other Side of the Wind, Welles combined both satire of Hollywood with the right-wing Hollywood types he had known, as represented by the members of "The Motion Picture Alliance for the Preservation of American Ideals."
TIME Feb 14, 1944
Over the room-temperature burgundy and the chopped chicken liver, politics came to Hollywood. As the battle began, the right wing took up prepared positions at the swank Beverly-Wilshire Hotel. The left strung its forces along rows of white-clothed tables at the equally swank palm-studded Beverly Hills Hotel, three miles away. Then the giants fired deadly after-dinner speeches at each other.
The Leftists started it off by announcing a big Free World Association dinner, starring Vice President Henry Wallace. Rightists quickly formed a club of their own, rushed into dinner last week on the eve of Wallace's appearance.
The Hollywood Rightists called themselves "The Motion Picture Alliance for the Preservation of American Ideals." Purpose: to correct "the growing impression that this industry is made up of and dominated by communists, radicals and crackpots." The Generalissimo is urbane, graying Sam Wood, who diluted For Whom the Bell Tolls so that Spanish Fascists became "nationalists" and Spanish Republicans came out like the American G.O.P. His general staff includes Walt Disney, Rupert Hughes, one writer from Republic Studios, and ten Metro-Goldwyn-Mayer executives, faithful minions of Tycoon Louis B. Mayer. Gary Cooper, Hemingway's Spanish Republican hero, ate dinner with them. Hearst papers gave the affair pages of pleased attention.