Concentration camps in Nazi Germany were originally set up in 1933 to terrorise Hitler’s political enemies; as war drew near, their function expanded to gratify his obsession (and that of Reichsführer Himmler, as head of the SS which administered them) with ‘purifying the race’ by getting rid of gypsies, Jews, ‘asocials’ — prostitutes, criminals, vagabonds — as well as the mentally ill and handicapped.