What would eventually be known as the Holocaust goes into full effect in 1941. Jews are sometimes executed in the streets, in their homes. Many of them are captured and sent to concentration camps. To get a sense of the scale of this operation, we have this excerpt from Michael Barenbaum's book, The World Must Know. The policy of extermination involved every level of German society and marshaled the entire apparatus of the German bureaucracy. Paris churches and the interior ministry supplied the birth records that defined and isolated Jews. The post office delivered the notifications of definition, expropriation, denaturalization, and deportation.