McCloy is an enormously significant figure in 20th century US history – as well as his war role, he went on to serve as World Bank president, US high commissioner for Germany, Council on Foreign Relations chair, and adviser to all presidents from Franklin D. Roosevelt to Ronald Reagan. That McCloy performed extensive legal work for several corporations in Nazi Germany before the War – among them chemical giant IG Farben, notorious for manufacturing Zyklon B, the cyanide-based pesticide used in extermination camps during the Holocaust – and got extremely rich in the process is relatively well known, but typically...