Corporate credit unions are united on a cooperative basis in the Central Credit Union (US Central Credit Union). Like the credit cooperatives, credit unions form associations of a higher level, which are called corporate credit unions. 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. 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. Credit unions are financial institutions, financial cooperatives of citizens, and in this capacity they are above all associations of people, not unification of capitals, which is typical, for example, for public companies.