It sounds as if you are thinking of the Sonderkommandosor 'special squads' that were forced to move corpses from the gas chambers to to the crematoria.
It is usually called the holocaust.
The Holocaust
Hitler's opinion of Jews had nothing to do with God, and the Holocaust had almost nothing to do with religion: the Nazis saw the Jews as Communists.
In the extermination camps the victims were gassed, then cremated. When killing 'in the field' the mobile killing units sometimes herded Jews into buildings which were then set on fire.
The Nazis. They were busy killing Jews by the millions, and the Frank family was hiding from them.
They did not quit killing the Jews until the last day of the war.
It was awful/criminal/evil/horrible/bad.
Killing was the 'final solution'.
It is usually called the holocaust.
He didn't do what the other Nazis were doing, killing the Jews. Instead he saved them and the other Nazis did not like him for that. After he saved the Jews he was hunted by the Nazis because of his betrayal.
The Holocaust
The Nazis were soldiers that went around killing and evacuating Jews. They worked for Hitler and got rid of the Jewish race.
Hitler's opinion of Jews had nothing to do with God, and the Holocaust had almost nothing to do with religion: the Nazis saw the Jews as Communists.
The killing of the Jews (The Holocaust) by the Nazis.
In the extermination camps the victims were gassed, then cremated. When killing 'in the field' the mobile killing units sometimes herded Jews into buildings which were then set on fire.
Answer: I watched a TV documentary which said some Nazis developed nightmares and other unwanted side-effects from shooting Jews, so the Nazis created the gas chambers, killing the Jews, but the Nazis wouldn't have to watch.
The Nazis. They were busy killing Jews by the millions, and the Frank family was hiding from them.