Membership in the credit union is voluntary and is open to all citizens bound by with joint work or residence, who wished to create a credit union to use its services and are willing to take on relevant commitments and responsibilities. Historically, credit unions were preceded by widespread development of credit cooperation in many countries of Europe and America. Corporate credit unions are united on a cooperative basis in the Central Credit Union (US Central Credit Union). Credit unions also differ from the traditional consumer cooperatives. Income received by the credit union shall be distributed among the shareholders or spent for the depreciation of services, that is, are the most effective means of meeting the needs of shareholders. Credit union services are available only to its shareholders. To reduce the risk of default on loans members of the credit union shall the joint guarantee. The relationship of shareholders with credit union are not client-based, they are co-operative, based on different principles and standards, in particular, on the principles of the law of obligations. 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. Corporate alliances are intermediaries between credit unions and financial markets.