Contrary to conventional wisdom, mass killing with poisoned gas was not invented by the Nazis, nor even the Germans. Cameron Munro, who has been researching this field for some years, has uncovered many of the origins and unsettling uses of such methods and ideas, some of which can be traced back to ancient times.

Im Frühjahr 1931 wurde in der Berliner NSDAP eine Ortsgruppe für gehörlose und schwerhörige Menschen gegründet.