For three crucial years in the 1930s, the Spanish Civil War dominated headlines in America and around the world, as volunteers flooded to Spain to help its democratic government fight off a fascist uprising led by Francisco Franco and aided by Hitler and Mussolini. Today we're accustomed to remembering the war through Hemingway’s FOR WHOM THE BELL TOLLS and Robert Capa’s photographs. But Adam Hochschild has discovered some less familiar yet far more compelling characters who reveal the full tragedy and importance of the war.