Congress may use its plenary power to unilaterally break treaty obligations between the United States and Native American tribes. Decided January 5, 1903 (argued October 23, 1902). Opinion of the Court: White Topic: Native American law. Lone Wolf v. Hitchcock, 187 U.S. 553 (1903), was a landmark United States Supreme Court case brought against the US government by the Kiowa chief Lone Wolf, who charged that Native American tribes under the Medicine Lodge Treaty had been defrauded of land by Congressional actions in violation of the treaty. Wiki link