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. Worldwide credit union movement is represented by regional confederations and national organizations within the World Council of Credit Unions. Among the U.S. credit unions, there are three groups that differ in terms of assets, shareholders, and business services. Unlike banks credit unions limit their activities to a closed circle of people. 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. Share contributions are transferred to the credit union on the basis of membership for the whole stay of a shareholder as member of the credit union and are the basis of membership. First Credit Union was savings unprofitable institution, or rather credit cooperative, providing services to its members. Credit unions of the open type are still controlled by their members, but at the same time provide services to people who are not its members (external customers). Until the 70's there was a proliferation of the U.S. credit unions due to the increase of their number and the number of shareholders, although it must be acknowledged that there was also and a qualitative growth.