Question

The mass murder of Jews in Russia was carried out by

Answer 1

I think it's Hitler

Answer 2

The mass murder of Jews in Russia was carried out by the Einsatzgruppen in the conquered territories.

The Einsatzgruppen started to use a new method of extermination - mobile gas chambers, in which the victims were killed by exhaust gas, in 1941.

From December 1941, these lethal vehicles were used in Chelmno.