Tex. Labor Code § 101.004: CONTRACT FOR WITHHOLDING UNION DUES FROM EMPLOYEE'S COMPENSATION VOID WITHOUT EMPLOYEE'S CONSENT.

A contract that permits or requires the retention of part of an employee's compensation to pay dues or assessments on the employee's part to a labor union is void unless the employee delivers to the employer the employee's written consent to the retention of those sums.

Acts 1993, 73rd Leg., ch. 269, Sec. 1, eff. Sept. 1, 1993.