57 (1) A collective agreement between an employers’ organization and a trade union or council of trade unions is, subject to and for the purposes of this Act, binding upon the employers’ organization and each person who was a member of the employers’ organization at the time the agreement was entered into and on whose behalf the employers’ organization bargained with the trade union or council of trade unions as if it was made between each of such persons and the trade union or council of trade unions and upon the employees in the bargaining unit defined in the agreement, and, if any such person ceases to be a member of the employers’ organization during the term of operation of the agreement, the person shall, for the remainder of the term of operation of the agreement, be deemed to be a party to a like agreement with the trade union or council of trade unions. Duty to disclose (2) When an employers’ organization commences to bargain with a trade union or council of trade unions, it shall deliver to the trade union, or council of trade unions a list of the names of the employers on whose behalf it is bargaining and, in default of so doing, it shall be deemed to bargain for all members of the employers’ organization for whose employees the trade union or council of trade unions is entitled to bargain and to make a collective agreement at that time, except an employer who, either alone or through the employers’ organization, has notified the trade union or council of trade unions in writing before the agreement was entered into that the employer will not be bound by a collective agreement between the employers’ organization and the trade union or council of trade unions. Binding effect of collective agreements on members of certified councils (3) A collective agreement between a certified council of trade unions and an employer is, subject to and for the purposes of this Act, binding upon each trade union that is a constituent union of such a council as if it had been made between each of such trade unions and the employer. Binding effect of collective agreements on members or affiliates of councils of trade unions (4) A collective agreement between a council of trade unions, other than a certified council of trade unions, and an employer or an employers’ organization is, subject to and for the purposes of this Act, binding upon the council of trade unions and each trade union that was a member of or affiliated with the council of trade unions at the time the agreement was entered into and on whose behalf the council of trade unions bargained with the employer or employers’ organization as if it was made between each of such trade unions and the employer or employers’ organization, and upon the employees in the bargaining unit defined in the agreement and, if any such trade union ceases to be a member of or affiliated with the council of trade unions during the term of operation of the agreement, it shall, for the remainder of the term of operation of the agreement, be deemed to be a party to a like agreement with the employer or employers’ organization, as the case may be. Duty to disclose (5) Where a council of trade unions, other than a certified council of trade unions, commences to bargain with an employer or an employers’ organization, it shall deliver to the employer or employers’ organization a list of the names of the trade unions on whose behalf it is bargaining and, in default of so doing, it shall be deemed to bargain for all members or affiliates of the council of trade unions for whose employees the respective trade unions are entitled to bargain and to make a collective agreement at that time with the employer or the employers’ organization, except a trade union that, either by itself or through the council of trade unions, has notified the employer or employer’s organization in writing before the agreement is entered into that it will not be bound by a collective agreement between the council of trade unions and the employer or employers’ organization.  1995, c. 1, Sched. A, s. 57.