AdvertisementUncovering A Grandfather's Secret Nazi PastMay 07, 2011NPR StafffacebookEmailUncovering A Secret Past: In a family portrait taken in 1941, Bruno Langbehn poses with his wife and children. It was not until after Langbehn's death, at 85, that his grandchildren learned he was not just a German dentist, but a dedicated Nazi and a member of Hitler's Schutzstaffel — the Nazis' chief paramilitary arm. (Courtesy of Martin Davidson)