Mattz v. Arnett

Mattz v. Arnett was a United States Supreme Court case in which the Court held that the land that had been the Klamath River Reservation and was incorporated into the Hoopa Valley Reservation in 1891 remained Indian country within the meaning of 18 U.S.C. §1151 despite the Act of June 17, 1892. The holding required California game wardens to return of five gill nets because the land was within the reservation boundaries and California lacked jurisdiction to enforce California law that interfered with rights reserved by the Yurok Tribe.