If this is a Nazi reference, Census data was used to send people to concentration camps here during the same era. Less awful than death camps, at least.

I think there are likely camps "with unusually high death counts" already in the US, but since ICE has clammed shut on the statistics, we don't and can't know. I think by the time the US settles on its future, the horrors that will arise from our very own camps will match the Nazis