In 1933 the first concentration camps were formed almost immediately after Hitler became Chancellor and control of the police was handed over to Reich Interior Minister Wilhelm Frick and the acting Interior Minister Prussian Hermann Goring. Used to torture captured enemies, these “camps” housed around 45,000 people until 1933 when they were largely destroyed by the Reichstag fire in the same year. Only about 3,000 prisoners remained in the camps when Heinrich Himmler took full control of the police and began using the camps to torture “racially undesirable elements” such as prisoners, Jews, homosexuals, and many other human groups. By the time of World War II, the number of camps rose to more than 300, as many of the “undesirable elements” were incarcerated en masse, generally without judicial process. At the start of World War II in 1939, concentration camps became a place where millions of incentivized people were enslaved, tortured, beaten, and worked to death, all as part of the war effort. During the war, Nazi camps for “undesirable people” spread across the country...