Labor Union Bargaining Unit Trade Union/Labor Union Union TRADUN Gewerkschaft Syndicat 労働組合 Sindicato 工会 TRADUN Trade Union A trade union (or a labor union in the U.S.) is an association of workers forming a legal unit or legal personhood, usually called a "bargaining unit", which acts as bargaining agent and legal representative for a unit of employees in all matters of law or right arising from or in the administration of a collective agreement.