Heart of Atlanta Motel Inc. v. United States
https://en.wikipedia.org/wiki/Heart_of_Atlanta_Motel_v._United_States
Beware of any post-FDR era Supreme Court decision which tests the scope of Congress's Commerce Clause powers. This is because when FDR's activist justices decided Wickard v. Filburn in Congress's favor in the early 1940s, they wrongly ignored that previous generations of justices had clarified the following about the scope of Congress's Commerce Clause powers. The states have never delegated to Congress, via the Constitution, the specific power to regulate intrastate commerce.
State inspection laws, health laws, and laws for regulating the internal commerce of a State, and those which respect turnpike roads, ferries, &c. are not within the power granted to Congress [emphases added]. Gibbons v. Ogden, 1824.
So the Court's PC decision in Atlanta Motel Inc. v. United States needs to be overturned imo.