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"In 1947, the Cold War came to Hollywood. Over nine tumultuous days in October, the House Un-American Activities Committee held a notorious round of hearings into alleged Communist subversion in the movie industry. The blowback was profound: the major studios pledged to never again employ a known Communist or unrepentant fellow traveler. The declaration marked the onset of the blacklist era, a time when political allegiances, real or suspected, determined employment opportunities in the entertainment industry. Hundreds of artists were shown the door--or had it shut in their faces. In Show…