; or (ii) refuses to become a signatory to, or otherwise adhere to, an agreement with one or more labor organizations with respect to that construction project or another related construction project. (2) Application of prohibition The provisions of this section shall not apply to contracts awarded prior to the date of enactment of this Act, and subcontracts awarded pursuant to such contracts regardless of the date of such subcontracts. (3) Rule of construction Nothing in paragraph (1) shall be construed to prohibit a contractor or subcontractor from voluntarily entering into an agreement described in such paragraph. (b) Recipients of grants and other assistance The head of each executive agency that awards grants, provides financial assistance, or enters into cooperative agreements for construction projects after the date of enactment of this Act, shall ensure that— (1) the bid specifications, project agreements, or other controlling documents for such construction projects of a recipient of a grant or financial assistance, or by the parties to a cooperative agreement, do not contain any of the requirements or prohibitions described in subparagraphs (A) and (B) of subsection (a)(1)