In the concentration camps of Nazi Germany, there is such a “special action group” (Sonderkommando), which mainly consists of former Soviet prisoners of war, Gypsies, anti-Nazis, Jews and so on.
They do not need to participate in the war. The main task is to be responsible for the free labor for the Germans. While undertaking the construction of civilian and military facilities, they also need to help deal with the bodies in the concentration camp. If there is a failure, the end is also ‘to take a bath’.
There were only 20,000 members of the Special Action Group (Sonderkommando) who survived the war.