42 USC 12634 - Prohibition on use of funds

(a) Prohibited uses 
No assistance made available under a grant under this subchapter shall be used to provide religious instruction, conduct worship services, or engage in any form of proselytization.
(b) Political activity 
Assistance provided under this subchapter shall not be used by program participants and program staff to
(1) assist, promote, or deter union organizing; or
(2) finance, directly or indirectly, any activity designed to influence the outcome of an election to Federal office or the outcome of an election to a State or local public office.
(c) Contracts or collective bargaining agreements 
A program that receives assistance under this subchapter shall not impair existing contracts for services or collective bargaining agreements.