Tex. Lab. Code § 101.114
A labor organizer or an officer, agent, or member of a labor union may not collect a fee, dues, or other sum in connection with membership in a labor union from a person without giving the person at that time a receipt that:
(2) states that the sum of money received is to be:
Acts 1993, 73rd Leg., ch. 269, Sec. 1, eff. Sept. 1, 1993.