41 U.S.C. § 8702: Prohibited conduct

A person may not—(1) provide, attempt to provide, or offer to provide a kickback; (2) solicit, accept, or attempt to accept a kickback; or (3) include the amount of a kickback prohibited by paragraph (1) or (2) in the contract price—(A) a subcontractor charges a prime contractor or a higher tier subcontractor; or (B) a prime contractor charges the Federal Government.