41 U.S.C. § 8702

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.