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A death squad consisting of SS, police and local people
The Einsatzgruppen were set up in order to kill Jews.
The 'official' purpose of the Einsatzgruppen was to combat guerrillas.
Einsatzgruppen means 'Deployment groups'/'Special Task Forces'.
The Nazis murdered people 'en masse' when the Einsatzgruppen were not efficient enough. There is overwhelming evidence of this.