He advocated progressively harsher discrimination, including the extermination of the Jews in the Holocaust. The Holocaust resulted in the total extermination of shtetls. Holocaust deniers often start by pointing out legitimate public misconceptions about the extermination camps. The Holocaust has been characterized as a project of industrial extermination. The Nazis distinguished between extermination and concentration camps. There were major resistance efforts in three of the extermination camps. They are liquidated inconspicuously in extermination camps. Psychiatry has waged a relentless war of extermination against us. The exploitation of the captives rested on the Nazi principle of "extermination through labor". The "Allgemeine SS" was responsible for the administration of both the concentration and extermination camps. He said that he had not known about the extermination camps. Thereafter, Nazi policy eventually changed to one of total extermination. In 2011 Demjanjuk was convicted of war crimes for having served at Sobibor extermination camp. It also contributed to the mass extermination of populations in German-occupied Europe. Death factories were just one of a number of ways of mass extermination.