25 U.S.C. § 5307 — Wage and labor standards

All laborers and mechanics employed by contractors or subcontractors (excluding tribes and tribal organizations) in the construction, alteration, or repair, including painting or decorating of buildings or other facilities in connection with contracts or grants entered into pursuant to this chapter, shall be paid wages at not less than those prevailing on similar construction in the locality, as determined by the Secretary^* of Labor in accordance with sections 3141–3144, 3146, and 3147 of title 40. With respect to construction, alteration, or repair work to which the Act of March 3, 19211 is applicable under the terms of this section, the Secretary of Labor shall have the authority and functions set forth in Reorganization Plan Numbered 14, of 1950, and section 3145 of title 40.

Any contract, subcontract, grant, or subgrant pursuant to this chapter, the Act of April 16, 1934 (48 Stat. 596), as amended [25 U.S.C. 5342 et seq.], or any other Act authorizing Federal contracts with or grants to Indian organizations or for the benefit of Indians, shall require that to the greatest extent feasible—

Notwithstanding subsections (a) and (b) of this section, with respect to any self-determination contract, or portion of a self-determination contract, that is intended to benefit one tribe, the tribal employment or contract preference laws adopted by such tribe shall govern with respect to the administration of the contract or portion of the contract.