Humans have always been gregarious creatures, initially organizing themselves in tribes. This model allowed individuals to survive by means of mutual help. The same relationship can be observed in the trade union movement. A worker caring for their interests alone has less ability to achieve a given purpose than an organization which acts collectively. The history of trade unions started in Great Britain, which is viewed as the cradle of communities of working people. the union movement developed in several stages running differently in different legal realities. The article below presents the trade unions from a psychological and historical perspective including the attempt to answer the question about the reasons for the decline in unionization.