Corporate credit unions are united on a cooperative basis in the Central Credit Union (US Central Credit Union). National Credit Union Administration (NCUA) - an independent federal agency, based in Washington (State of Columbia), established by the U.S. Congress to oversee the federal credit union system. Among the U.S. credit unions, there are three groups that differ in terms of assets, shareholders, and business services. 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. 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. The relationship between credit unions and shareholders arise from the membership and are not customer relationship. In some cases, the initiators of credit unions can be trade unions, associations such as social support centers and others. 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.