29 CFR §4.2

Section 2(b)(1) of the Service Contract Act of 1965 provides in effect that, regardless of contract amount, no contractor or subcontractor performing work under any Federal contract the principal purpose of which is to furnish services through the use of service employees shall pay any employees engaged in such work less than the minimum wage specified in section 6(a)(1) of the Fair Labor Standards Act of 1938, as amended.