Fund of Mutual Financial Aid of the credit union can be extended by sponsorship contributions from businesses, organizations, including on a returnable basis. Credit unions encourage savings of citizens, setting compensation payments (interest) on savings and provide from these savings loans to their members. When organizing the credit union it is important that people know each other and know the extent to which each of them is trustworthy. First central bank of credit unions appeared in 1876. Credit unions began to appear rapidly in many European countries. National Credit Union Insurance Fund was created by Congress in 1970 to insure deposits of credit union members in the amount of 100 thousand dollars. Until the mid-XX century, credit unions in the United States had little assets that did not exceed, as a rule, 100 thousand dollars Shareholders in corporate organizations are basic credit unions, besides the same union can be a shareholder of several corporate organizations. Credit unions historically formed as a special form of social support, initially taken upon themselves the social mission of protecting the interests of citizens in the field of financial services. To increase the number of credit unions in 1979 was adopted the corresponding law that serves as the legal basis of their activity. 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.