Three German Civilians Executed -- The black hood is placed over the head of Peter Kohn before the execution is carried out. Three German civilians the first war criminals to be tried in Germany, were hanged at dawn today June 29, at the Military prison at Rhineback. All three were found guilty of the murder of American airman who parachute to earth from his blazing bomber last August 15. The three men, Peter back, a cripple and rural leader of the Nazi party; Peter Kohn, one Armed German vetera