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 his “Show Trial: Hollywood, HUAC, and the Birth of the Blacklist,” Thomas Doherty recounts one of the darkest chapters in the history of the American entertainment industry. In this installment of “Leonard Lopate at Large” on WBAI, Thomas Doherty talks about the book and the troubling events that it covers.