 The lyrics detail <unk> 's surgical experiments on patients at the Auschwitz concentration camp during World War II . <unk> 's <unk> were conducted on such groups as dwarfs and twins , and included both physical and psychological examinations . Among the tests he performed that are mentioned in " Angel of Death " are experimental <unk> performed without anesthesia , transfusion of blood between twins , isolation endurance , <unk> , <unk> with lethal <unk> , sex change operations , the removal of organs and limbs , and <unk> . 
