who propounded the theory of division of labour
Division of labour In Plato's Republic, the origin of the state lies in the natural inequality of humanity, which is embodied in the division of labour.
Labor unions in the United States Unions began forming in the mid-19th century in response to the social and economic impact of the industrial revolution. National labor unions began to form in the post-Civil War Era. The Knights of Labor emerged as a major force in the late 1880s, but it collapsed because of poor organization, lack of effective leadership, disagreement over goals, and strong opposition from employers and government forces.