Contracts involving the payment or expenditure of any money or affecting any property belonging to the Choctaw, Chickasaw, Cherokee, Creek, or Seminole Tribes of Indians, including contracts for professional legal services, may be made by said tribes, with the approval of the Secretary of the Interior, or his authorized representative, under such rules and regulations as the Secretary of the Interior may prescribe: Provided, That the provisions of this section shall not apply to contracts for professional legal services involving the prosecution of claims against the United States. (July 3, 1952, ch. 549, § 1, 66 Stat. 323 .) Statutory Notes and Related Subsidiaries Contracts Involving Choctaw and Chickasaw Tribes Act July 3, 1952, ch. 549, § 2, 66 Stat. 323 , provided: “That the second proviso in section 28 of the Act of April 26, 1906, ch. 1876 ( 34 Stat. 148 ) [not classified to the Code], and the provisions contained in the fifth paragraph of section 17 of the Act of March 3, 1911, ch. 210 ( 36 Stat. 1070 ) [not classified to the Code], dealing with contracts made by the Choctaw and Chickasaw Tribes of Indians for professional legal services of attorneys, are hereby repealed.”