The German Ministry of Justice , in 1967 , named about 1200 camps and subcamps in countries occupied by Nazi Germany , while the Jewish Virtual Library writes `` It is estimated that the Nazis established 15,000 camps in the occupied countries . '' A list drawn up in 1967 by the German Ministry of Justice names about 1200 camps and subcamps in countries occupied by Nazi Germany , while the Jewish Virtual Library writes `` It is estimated that the Nazis established 15,000 camps in the occupied countries . ''