Death camps differed from concentration camps located in Germany proper, such as Bergen-Belsen, Oranienburg, Ravensbrück, and Sachsenhausen, which were prison camps set up prior to World War II for people defined as 'undesirable'. From March 1936, all Nazi concentration camps were managed by the "SS-Totenkopfverbände" (the Skull Units, SS-TV), who operated extermination camps from 1941 as well. An SS anatomist, Dr Johann Kremer, after witnessing the gassing of victims at Birkenau, wrote in his diary on 2 September 1942: "Dante's Inferno seems to me almost a comedy compared to this. They don't call Auschwitz the camp of annihilation for nothing!" The distinction was evident during the Nuremberg trials, when Dieter Wisliceny (a deputy to Adolf Eichmann) was asked to name the "extermination" camps, and he identified Auschwitz and Majdanek as such. Then, when asked, "How do you classify the camps Mauthausen, Dachau, and Buchenwald?", he replied, "They were normal concentration camps, from the point of view of the department of Eichmann."