United States v. Rock Royal Co-op, 307 U.S. 533 (1939), was a United States Supreme Court case in which the Court held that the Commerce Clause allows federal regulation of milk processed and sold entirely within the state of New York because the company used a mixture of raw milk from farms within and outside the state of New York..
Significance This case demonstrates the far-reaching nature of the Commerce Clause, which essentially allows Congress authority over interstate commerce that "does not differ in character or extent from that retained by the States over intrastate commerce."
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