The term "bargaining agent" refers to a person or organization that represents workers in negotiations with their employer for better wages, benefits and working conditions. Full definition
With unions, the market is no longer as competitive because the union holds a monopoly enforced by law when it becomes the exclusive bargaining agent for its members. (educationnext.org)
Are unions allowed to forgo their privilege as the «exclusive bargaining agent» and negotiate only on behalf of members? (law.stackexchange.com)
«trade union» means a trade union as defined in the Labour Relations Act, 1995 that has the status of exclusive bargaining agent under that Act in respect of any bargaining unit or units in a workplace and includes an organization representing workers or persons to whom this Act applies where such organization has exclusive bargaining rights under any other Act in respect of such workers or persons; («syndicat») (ontario.ca)