@Walter Hinteler,

Only for the purpose of arresting, terrorising, kidnapping and beating up political opponents such as communists, social democrats but also Jews, the police, praised until 1933 for their impartiality, were given an "auxiliary police force" (HiPo): SA Brown Shirts. (Photo from early 1933, source: Dorsten town archive)
Kemna concentration camp was one of the first concentration camps. It was run since 1933 by the brown shirts, when the Nazis stopped the salaries for
auxiliary police force.
Kemna had had up to 3,500 prisoners, primarily communists, but also socialists, dissenting Catholics and Protestants and trade unionists.