here is no better précis of how the Left thinks about the world, and acts on it, than the British journalist Nick Cohen’s article appearing in the new issue of Standpoint. Cohen writes a candid appraisal of what left-wing politics did to the mind and life of the late actor Corin Redgrave, brother of the more famous Vanessa, who like her brother, is a lifetime member of a small fanatic Trotskyist sect, the Workers Revolutionary Party, led by a man named Gerry Healy. The group was so fanatic that it accused Trotsky’s American followers of having been responsible for his...