§ 157. Deductions from retirement allowances. A person who (1) retired from employment with the state, (2) is receiving a retirement allowance from a state retirement system, and (3) at the time of his retirement had group life insurance premiums and employee organization dues deducted from his salary, may elect to have deductions for such purposes made from his retirement allowance by providing notification in writing to the head of the retirement system from which he retired. Such life insurance deduction shall be transmitted to the insurance carrier. Such dues deduction shall be transmitted to the employee organization. Any such written authorization may be withdrawn by such retired employee at any time upon written notice of such withdrawal to the head of the retirement system from which he retired.