Open this photo in gallery: Winthrop Pickard Bell, left, with two other prisoners at Germany’s Ruhleben prison camp during the First World War, where he was interned as a postdoctoral student after another student accused him of criticizing the Kaiser. In 1939, Bell was the first to warn about Hitler’s plan to exterminate non-Aryan races throughout the world.Mount Allison University Archives Jason Bell is an associate professor of philosophy at the University of New Brunswick and author of Cracking the Nazi Code: The Untold Story of Canada’s Greatest Spy. Citizens of liberal democracies sometimes complain that their governments engage in...