Times like these I'd like to recommend this great book "Hitler's First Victims" by Ryback that is basically about how the Nazis tested the waters of what they could get away with at #Dachau , and the ultimately ineffective efforts of the state prosecutors to defeat them.
#book
https://bookrastinating.com/book/633564/s/hitlers-first-victims
@kb9ens They tested the concept of concentration camps even before in the colonized countries of Germany.