Who is Erich Fuchs from 'the Good Old Days': The Holocaust as Seen by Its Perpetrators and Bystanders and what is their importance?

Fuchs was a skilled motor mechanic and joined the Nazi party in 1933, being employed in 1940 to operate and improve gas vans. These vans had sealed cargo areas in which victims were packed and then asphyxiated by the vehicle's exhaust as it was driven to the internment site. Fuchs installed gassing systems at Belzec and operated gassing engines at Sobibor before being given a position of importance at Treblinka. From 1942 through 1943 he again researched methods of mass murder, using mentally ill patients as experimental subjects. After the war he worked as a truck driver, a mechanic, and a car salesman. He was sentenced to four years' imprisonment in 1966 for being an accessory to murder of at least 79,000 people.