Corporate credit unions are united on a cooperative basis in the Central Credit Union (US Central Credit Union). Activity of the credit union consists of organizing mutual financial assistance by meeting the needs of its members in the services of saving and obtaining loans. Members of credit unions place in credit unions usually free fund balances, ie those that remain after expenses devoted to education of children, the acquisition of new properties, additional pension benefits, etc. 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. The main activities of credit unions, aimed at the organization of mutual aid and social support of citizens is not intended to profit. In some cases, the initiators of credit unions can be trade unions, associations such as social support centers and others.