Slavery takes many forms...
One of the first things to be established after a concentration camp is formed...
https://www.reuters.com/article/lifestyle/new-book-reveals-horror-of-nazi-camp-brothels-idUSTRE57G45X/
https://www.dw.com/en/new-book-reveals-horrors-of-brothels-in-nazi-concentration-camps/a-4581173
https://en.m.wikipedia.org/wiki/German_military_brothels_in_World_War_II
https://en.m.wikipedia.org/wiki/German_camp_brothels_in_World_War_II
And remember evangelicals voted for this, the mass dehumanization of people for personal profit.