29 C.F.R. § 4.150
The Act, in section 2(b), makes it clear that its provisions apply generally to all service employees engaged in performing work on a covered contract entered into by the contractor with the Federal Government, regardless of whether they are the contractor's employees or those of any subcontractor under such contract. All service employees who, on or after the date of award, are engaged in working on or in connection with the contract, either in performing the specific services called for by its terms or in performing other duties necessary to the performance of the contract, are thus subject to the Act unless a specific exemption (see §§ 4.115 et seq.) is applicable. All such employees must be paid wages at a rate not less than the minimum wage specified under section 6(a)(1) of the Fair Labor Standards Act (29 U.S.C. 206(a)(1) ), as amended. Payment of a higher minimum monetary wage and the furnishing of fringe benefits may be required under the contract, pursuant to the provisions of sections 2 (a)(1), (2), and 4(c) of the Act.
29 C.F.R. §4.150