On September 29 and 30, special units of the SS called "Einsatzgruppen", and some local Ukrainians who supported the Nazis, took these people to the ravine at Babi Yar. They made them put all of their things in piles. They made them strip naked. The area was so crowded that by the time people heard gunshots, there was no way to escape. The Nazis took people ten at a time into the ravine, made them lay down, and shot them with machine guns.