Einstatsgruppen, or " Einsatzgruppen," were mobile killing units deployed by Nazi Germany during World War II, particularly during the invasion of the Soviet Union. Their primary role was to carry out mass shootings of Jews, communists, and other perceived enemies of the Nazi regime, resulting in the deaths of over a million individuals. These units operated in collaboration with the Wehrmacht and local collaborators, exemplifying the brutal tactics of the Holocaust. Their actions are a stark reminder of the atrocities committed during the war and the systematic nature of genocide.