The House Un-American Activities Committee opened its Hollywood hearings on October 20, 1947. The committee wanted to show that Communists had worked their way into the film industry, and the studios, afraid of a boycott, largely went along. The hearings made careers and broke them.
Friendly witnesses named names. The fear was real. Men like director Leo McCarey and actor Adolphe Menjou spoke against colleagues, and the committee got the headlines it wanted. The studios pledged not to employ anyone who was suspected, and the pledge became the basis of the blacklist.
The defiant ones became the story. Ten men refused. Ten screenwriters and directors refused to answer the question about party membership, and they were cited for contempt and jailed. They became known as the Hollywood Ten, and their stand turned the hearings into a test of conscience rather than a simple investigation.
The blacklist lasted over a decade. Hundreds of writers, actors, and directors were barred from work, some under their own names and some under the screen of aliases. Careers were quietly ended, and the industry policed itself without needing the government to do it.
The hearings are remembered as a low point of the early Cold War. The fear was real, but the committee fed it and used it, and the damage to people who had done nothing more than hold opinions was lasting. Hollywood spent years recovering from what it did to itself.