"In any free society, a club should have the right to restrict its membership to, say, women, teetotallers, veterans, Negroes, Baptists, Jews, or whites. Equally, clubs which wish to admit both whites and Negroes should, under the same rule, have the effective right to do so, and be protected from private coercion of the Ku Klux Klan type."

https://mises.org/mises-wire/state-coercion-and-injustice-apartheid