Katzenbach v. McClung,
379 U.S. 294 (1964)
A thoroughly ridiculous ruling. As I've explained at length in earlier posts, interstate commerce has everything to do with trade between the states--or specifically, the shipping of goods across state lines--and nothing to do with racial discrimination. (See: Justice Story's Exposition on the Commerce Clause)
Justice Douglas even went as far as to argue that the Fourteenth Amendment's Equal Protection Clause was grounds for sustaining the act. I find this assertion to be patently absurd. The amendment is not ambigious at all: "No
State shall ... deny to any person within its jurisdiction the equal protection of the laws."