The lyrics detail Mengele 's surgical experiments on patients at the Auschwitz concentration camp during World War II . Mengele 's explorations 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 surgeries performed without anesthesia , transfusion of blood between twins , isolation endurance , gassing , injections with lethal germs , sex change operations , the removal of organs and limbs , and abacination .