73. No certified association that has entered into a collective agreement, and no group of employees subject to such agreement or to an arbitration award having the effect thereof, shall take steps to become a member of another association or to affiliate therewith, except during the ninety days preceding the date of expiration or renewal of the agreement or the date of expiration of the arbitration award.
R. S. 1964, c. 141, s. 61; 1969, c. 47, s. 33; 1977, c. 41, s. 41.