Killing people is easy, if it's not by gassing you always resort the the tried beforehand methods of lining a few hundred at a time and machine gunning them, or go one by one with a pistol, that's the Babi-Yar approach.

Crematoria were to get get rid of the bodies. Or at least compact them enough, as I can't really see how one hides all those tons of human ashes with half burnt bones emerging.

__________________