At the organization of the credit union it is important that people know each other and know the extent to which each of them is trustworthy. Credit union services are available only to its shareholders. Among the U.S. credit unions, there are three groups that differ in terms of assets, shareholders, and business services. To reduce the risk of default on loans members of the credit union shall the joint guarantee. 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.