Historically, credit unions were preceded by widespread development of credit cooperation in many countries of Europe and America. Most modern credit unions represent specialized consumer cooperatives of citizens associated by the principle of social community: place of work, place of residence, profession, or any other shared interest. Cooperation between credit unions, how they would not have been named, took place always, from the moment when the movement moved outside one credit union. Shareholders in corporate organizations are basic credit unions, besides the same union can be a shareholder of several corporate organizations. Credit unions are financial institutions, financial cooperatives of citizens, and in this capacity they are above all associations of people, not unification of capitals, which is typical, for example, for public companies. Credit Union - a non-profit financial institution specialized in mutual financial assistance by providing savings and credit services to their members. A potential new member of a credit union must submit a recommendation of shareholders in which the referee becomes a warrant of a future member of the credit union.