Although Alasdair MacIntyre is best known today as the author of After Virtue (1981), he was, in the 1950s and 1960s, one of the most erudite members of Britain's Marxist Left: being a militant within, first, the Communist Party, then the New Left, and finally the heterodox Trotskyist International Socialism group. This selection of his essays on Marxism from that period aims to show that his youthful thought profoundly informed his mature ethics,...