More than 70 years have passed since the liberation of the death camps and many of those involved have now died.
So the trial of Oskar Groening was one of the last of its kind.
Mr Groening, known as the “book-keeper of Auschwitz”, was allegedly responsible for counting banknotes confiscated from prisoners.
Prosecutors in Lueneburg, northern Germany, also allege that he hid victims’ luggage away from new arrivals, to disguise the victims’ fate.
Oskar Gröning (born 10 June 1921) is a German former SS junior squad leader who was stationed at Auschwitz concentration camp.