October 17, 2015 is the centenary of the birth of Arthur Miller, one of the literary left’s shining lights and righteous crusaders against some of liberals’ worst demons: Joe McCarthy, “HUAC,” and, more generally, anti-communism. Yes, anti-communism. As often noted by Harvard’s Richard Pipes and the Hoover Institution’s Robert Conquest, few things have animated liberal animus quite like anti-communism. It’s not that liberals have been pro-communist so much as they are anti-anti-communist. They dislike anti-communists more than they dislike communists. Their preferred demon isn’t Joe Stalin but Joe McCarthy. As James Burnham, the great ex-communist, put it, “for the left,...