A labor union or trade union is a kind of voluntary organization formed by workers through collective action. Such type of organization have bonded together to achieve common goal in key areas like wages, duty hours, and working condition forming a cartel of labors. It also plays an important role to promote employee to improve their working condition, service and protecting their interest and maintaining industrial relations. The trade union, through its leadership, bargains with the employer on behalf of union members and negotiates labor contracts with employers. Industrial relations are closely linked with trade unionism. Trade unionism is a united movement of working class, which seeks to make improvement of the economic and social status of the wage earners through united action.