In 1908. the spread of credit unions has reached the United States. In 1935 President Roosevelt signed the state Charter on credit unions, which became a law. Like the credit cooperatives, credit unions form associations of a higher level, which are called corporate credit unions. Credit unions encourage savings of citizens, setting compensation payments (interest) on savings and provide from these savings loans to their members. Principles of cooperative democracy and interaction were adequate to the purposes for which people joined credit unions. Specialization of credit unions to provide financial services to its shareholders requires a particularly strict regulation of membership and acceptable activities. 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. In the case of default the shareholder - individual will respond with its property and, in addition, is jointly and severally liable with the credit union's commitments. Credit cooperatives and credit unions exist in many different forms. The main differences relate to the nature of the membership and the opening of a credit institution. Credit unions base their activities on savings of shareholders, their shares and savings contributions, which make up the fund of mutual financial assistance - a source of cash loans to shareholders. Today, the World Council of Credit Unions is represented as members four regional confederations and twelve national associations.