I think this is the first case the Supreme Court heard: https://en.m.wikipedia.org/wiki/Engblom_v._Carey https://en.m.wikipedia.org/wiki/Engblom_v._Carey Becau

I think this is the first case the Supreme Court heard: https://en.m.wikipedia.org/wiki/Engblom_v._Carey https://en.m.wikipedia.org/wiki/Engblom_v._Carey Because of the lack of any prior Third Amendment jurisprudence, this decision established three important holdings not previously articulated: (1) that the National Guardsmen qualify as soldiers under the Third Amendment; (2) that the Third Amendment applies to state as well as federal authorities, i.e., is incorporated against the states; and (3), that the protection of the Third Amendment extends beyond home owners, that is, those only with a fee simple arrangement, but includes anyone who, within their residence, has a legal expectation of privacy and a legal right to exclude others from entry into the premises.[1] The majority held that the correctional officers' occupancy in the rooms was covered under the legal rules of "tenancy" and was therefore protected under the Third Amendment. Basically, the state kicked striking prison guards out of their employee benefit housing for national guard troops to use while the national guard was used for overseeing the prison. Nixon started “the war on drugs”, and it looks like they didn’t try to use that as a defense.