“[Nitze] was a hawk. He was always saying, ‘We should build more wepaons’…but his biggest enemies were often on the right. His biggest enemy in the eighties was probably Richard Perle…Kennan is even less of a liberal than Nitze was a conservative…but socially Kennan was a serious conservative,” says Nicholas Thompson, author of The Hawk and the Dove: Paul Nitze, George Kennan, and the History of the Cold War.