Whenever one or more of the persons employed by a board of education shall agree, in writing, to participate in any plan for the purchase of bonds of the United States government the board may, by a recorded roll call majority vote of its full membership direct the secretary of the board to deduct from the salaries of such employees as shall participate in such plan under such rules as may be established by the board specified amounts for the purchase of bonds and pay the total amount of such deductions directly or indirectly to the Federal Government for such bonds, and the making of any such deductions shall be construed as voluntary payments by the employee.
N.J.S. § 18A:16-8