United States v. Rock Royal Co-op
Supreme Court of the United States
Decided June 5, 1939
Full case name	United States v. Rock Royal Co-op
Citations	307 U.S. 533 (more)
Holding
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.
Court membership
Chief Justice Charles E. Hughes Associate Justices James C. McReynolds · Pierce Butler Harlan F. Stone · Owen Roberts Hugo Black · Stanley F. Reed Felix Frankfurter · William O. Douglas
Case opinions
Majority	Reed
Concur/dissent	Black, joined by Douglas
Dissent	McReynolds, joined by Butler
Dissent	Roberts
Laws applied
Commerce Clause

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.^[1]

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."^[2]

• Text of United States v. Rock Royal Co-op, 307 U.S. 533 (1939) is available from: Cornell Findlaw Justia

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