A *concentration* of all citizens of a certain demographic.
Also, bit disingenuous for you to be like "hurr we're not talking about ww2 noob" when you're dismissing the very simple fact that they are concentration camps.
I want to simply ask, what is a concentration camp then? Because....well....
"Per the Emergency Detention Act (Title II of the McCarran Internal Security Act of 1950), six concentration camps were constructed in 1952 in the event that the U.S. government declare a state of emergency. They were originally intended to contain alleged communists, anti-war activists, civil rights ‘militants,’ and other dissidents. They were maintained from the 1950s to the 1960s, but they were never used for their intended purpose."