“In continuation of the policies adopted in Poland in the fall of 1939, police and other special units began to lead Jewish villagers – men, women, and children – into the surrounding forests. There they were killed with a pistol shot in the neck, often after they had been forced to dig their own grave before the eyes of their murderers.”  
Many people believed that during the Holocaust most, or all, Jews that were killed were murdered in concentration camps. However, how does the quote above contradict what most people believe?