Finally in 1933, after the Nazis seized power, part of Kislau castle was made into a concentration camp.
[2] Unlike most concentration camps, Kislau was overseen by Baden Interior Ministry instead of CCI.
[2] Ludwig Marum, a socialist parliament member, was murdered in Kislau by SA and SS forces in 1934.
[1][2] After being closed, Kislau prison and workhouse continued functioning in the Nazi era.
In 1940 two of Himmler's representatives inspected the site to see if it could be utilised as a concentration camp, but the plan was never fulfilled.