Where are your sources for 120k people?attributed to Eichmann at the Nuremburg Trials. As is clarified in another response, that 6 million figure is merely jewish casualties. Total death toll edges closer to 11 million. Also the name of the group is the Einsatzgruppen. The name means "task force" or "deployment groups" and were a special arm of the Shutzstaffel tasked with carrying out executions, most commonly in newly conquered areas of the ostfront. The official procedure changed from hunter/killer squads to death camps for several reasons, namely efficiency and overall expense but also due to the fact that even these trained and willing killers found it too hard to carry out their duties as time dragged on. Many suffered severe mental strain, horrible nightmares and even physical ailments. Many turned to alcoholism or excessive brutality to cope. There exists a story about Heinrich Himmler that details how even those full of hatred could be affected by seeing their barbarism carried out in person, the story is detailed here and it is very telling: http://www.holocaustresearchproject.org/einsatz/himmlerinminsk.html