bargaining agent
noun [ C ]
ukus WORKPLACE US
a labour union (= an organization that represents workers) that is elected by workers to represent their interests officially in discussions with company owners and managers in order to reach an agreement about the workers' pay, working conditions, etc., or the person who carries out such discussions for the union:
Under card-check or "neutrality" agreements, unions become the bargaining agent if a majority of employees sign representation cards.