ess mandated that simpler cases involving lesser offenders would be tried before more complicated cases involving officials higher up in the Nazi regime. With time, however, prosecution became less sever and the U.S. became more concerned with the Cold War. When Denazification ended in March 1948, the most serious cases had not yet been tried. As a result, numerous former Nazi functionaries escaped justice, much to the regret of many Germans.Harry S Truman who was president, believed in "talking tough" to the Russians when he thought it necessary, but at first he continued Roosevelt's policy of preserving good relations with Stalin. He did not threaten Stalin with using the atomic bomb at the Potsdam Conference in July-August, though he informed him of the successful test at Alamogordo, New Mexico, on July 16th. Truman was surprised that Stalin took the news calmly. Of course, like Roosevelt, Truman wanted Soviet cooperation against Japan, because he could not be certain that the atomic bomb would suffice to knock her out of the war. In March 1946, Winston S. Churchill visited the U.S. and made his famous Iron Curtain speech at Westminster College in Fulton, Missouri. He deplored Soviet domination over Eastern Europe and warned of the Soviet threat to Western Europe. Some quotes from his speech are: “If now the Soviet government tries, by separate action, to build up a pro-Communinst Germany in their areas, this will cause new serious difficulties in the American and British zones, and will give the defeated Germans the power of putting themselves up to auction between the Soviets and the Western democracies. Whatever conclusions may be drawn from these facts--and facts they are--this is certainly not the liberated Europe we fought to build up. Nor is it one which contains the essentials of permanent peace…Twice the United States has had to send millions of its young men across the Atlantic to fight the wars. But now we all ...