Mengele was also in charge of Auschwitz's camp "hospital." This was not like a regular hospital. Prisoners who were doctors, like Gisella Perl, worked there. They tried to help prisoners who were sick or hurt, but they had no medications or medical supplies, not even clean bandages or running water. If patients did not get better quickly, Mengele sent them to the gas chambers, or Nazi doctors killed them by injecting them with phenol.