On Nov. 24, 1947, Congress voted to hold the “Hollywood 10” in contempt. The following day the Motion Picture Association of America announced that the “Hollywood 10” directors, producers, and writers who had refused to testify before the House Un-American Activities Committee (HUAC) would be fired or suspended.
The Hollywood 10 were Albert Maltz, Dalton Trumbo, John Howard Lawson, Samuel Ornitz, Ring Lardner Jr., Lester Cole, Alvah Bessie, Herbert Biberman, Edward Dmytryk, and Robert Adrian Scott.
The ABA Journal notes,
Walt Disney and Ronald Reagan, then president of the Screen Actors Guild, testified before the [HUAC] committee, as did other famous actors. Others actively organized against the investigation as an attack on freedom of speech. And 19 witnesses subpoenaed by HUAC—many of them important Hollywood writers and artists—said they would not provide testimony implicating colleagues in Hollywood.
This censorship impacted popular culture for years to come, as noted by screenwriter Allen Rivkin in Jewish Currents,
Movies of the 1950s did not display any evidence of the populist spirit which infused some of the more notable ‘30s and ‘40s films. On the contrary, studios complacently turned out hundreds of movies which… debased women, ignored Blacks and other minorities, and exalted war and imperialism…
Read more in This Day in Alternate History.