40 U.S.C. chapter 31, subchapter IV, Wage Rate Requirements (Construction), formerly known as the Davis-Bacon Act, provides that contracts in excess of $2,000 to which the United States or the District of Columbia is a party for construction, alteration, or repair (including painting and decorating) of public buildings or public works within the United States, shall contain a clause (see 52.222-6) that no laborer or mechanic employed directly upon the site of the work shall receive less than the prevailing wage rates as determined by the Secretary of Labor.