[megapolitics]

>NSDAP were in power for over a decade before the first concentration camp was ever built.

The first concentration camp, Nohra, opened in 1933, the year the Nazis took power. The more well known Dachau was also opened that year.

[MandieD]

I think GP was mixing up concentration camps (Konzentrationslager), an umbrella term for both work/prison camps (never really secret, killing prisoners was a side effect but not the ostensible purpose, initially targeted German citizens with leftish politics who were vocal against the new regime) with extermination camps (subtype of concentration camp, not publicized, engineered for mass murder, where most of the Jews and a lot of the Roma/Sinti in Nazi-occupied Europe still there by 1942 were sent)

Dachau was a concentration camp located in a Munich suburb that a large number of prisoners survived (but a lot did not) and were even sometimes (but not often) released from. Really bad, but nothing that awful governments hadn’t done before - in fact, was being done by our eventual allies to the East at the same time.

Auschwitz was an extermination camp (Vernichtungslager), located in a distant corner of Poland that only a tiny fraction of people sent there survived. These camps and system were a new horror for the world, and the center of the Nuremberg war crimes trials. Those were planned at the beginning of 1941 (Wannsee Conference), so yes, put into operation about a decade after the Nazis came to power.

Some places that were initially set up as work (to death) camps were later turned into outright extermination camps.