Labor unions are collective workers’ organizations whose goal is to represent, protect and promote the rights and interests of their members. Therefore, labor unions exert pressure on the employers and the government in order to improve working environment and workers’ positions. Labor unions form during the industrial revolution in the 19th century when workers realize that they, as individuals, cannot protect themselves nor confront with the employer who treats them extremely inhumanly. As a result, workers start to organize in order to oppose their employers and fight for their rights. From industrial revolution to the present day working conditions have changed considerably, but opposed interests of workers and employers still remain. Therefore, labor unions and their fight for better society is needed today as it was before. Today, workers’ rights are protected by the Labor Act that insures minimum working conditions that are modified and upgraded through collective bargaining and Collective Agreement. The aim of this paper is to describe the activities of labor unions at the national, industrial and corporate level. At the national level, activities of the labor union includes social dialogue with the government and the association of employers on topics such as economics, social politics and working rights. At the industrial level, labor unions fight for better quality of working environments and for all other interests of their members. At the corporate level, exemplified on the Labor Union Subsidiary Plinara d.o.o., with fight for regulating and improving material and non-material workers’ rights, labor unions are positively affecting workers’ satisfaction and well-being which indirectly leads to better business results of the company.