What was the Nazi thinking behind the establishment of the ghettos? Indeed, what was their primary purpose?

to segregate people from the other like the gays or the jews

isolate them from the rest.

can someone just answer this

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.