einsatzgruppen:

Mobile units of the Security Police and SS Security Service that followed the German armies to Poland in 1939 and to the Soviet Union in June, 1941. Their charge was to kill all Jews as well as communist functionaries, the handicapped, institutionalized psychiatric patients, Gypsies, and others considered undesireable by the nazi state. They were supported by units of the uniformed German Order Police and often used auxiliaries (Ukrainian, Latvian, Lithuanian, and Estonian volunteers). The victims were executed by mass shootings and buried in unmarked mass graves; later, the bodies were dug up and burned to cover evidence of what had occurred.

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