Something I wanted to clarify about my last edit  I simply had a problem with the original post since it wasnt accurate Gas chambers were specifically built for exterminating the groups mentioned in my edit Jehovas witnesses and homosexuals were put into concentration camps and surely mistreated beyond any measure conceivable to us The fact remains though that they presented a normal and small portion of those prisoner populations and were not treated different than the rest of the prisoners Jews Sinti and Roma were people the Nazis specifically targetted for extermination as a people Later on there wasnt even imprisonment for these people they were simply transported to the death camps  A Jehovas witness could have saved its life by denouncing its communitys faith and agreeing to be drafted to the Wehrmacht a choice Jews didnt have But this isnt my point and Im not suggesting they should have done that  But the fact I want simply to put out by my edit is  Ive read about the Holocaust and the Euthanasia operation Ive read about the concentration and death camps and the SS Gestapo and SD security apparatus but I didnt read about Homosexuals or Jehovas witnesses being specifically targetted for extermination by gas as distinct groups maybe still as a part of the prisoner population but not specifically   As a reference I want to suggest Eugen Kogons The SS state or the books of Raul Hilberg