Mauthausen concentration camp
The two largest camps in the Mauthasen complex (Gusen I and the main Mauthausen camp) had the worst conditions. Both were classed as "Grade III" (Stufe III) concentration camps. This meant they were supposed to be the toughest camps for the "incorrigible political enemies of the Reich". (Here, “incorrigible" means "impossible to correct.") Many people were deported to Mauthausen and Gusen just to be executed.