John "Iwan" Demjanjuk was at the center of one of history's most complex war crimes trials. But why did it take almost sixty years for the United States to bring him to justice as a Nazi collaborator? The answer lies in the annals of the Cold War, when fear and paranoia drove American politicians and the U.S. military to recruit "useful" Nazi war criminals to work for the United States in Europe as spies and saboteurs, and to slip them into America...