A worker cooperative is a cooperative owned and operated by its "worker-owners". There are no outside, or consumer owners, in a worker's cooperative - only the workers own shares of the business. Unions are often unnecessary in worker cooperatives because the workers have direct control over the management and ownership of the business - they are negotiating with themselves. Some worker cooperatives still choose to become members of local unions for particular reasons - the printing industry is one example in which union shops often receive a special market of business (union members).
Worker coops in the U.S.
The United States Federation of Worker Cooperatives is the only organization in the U.S. representing worker cooperative interests nationally. There are local networks and federations throughout the U.S. in the San Francisco Bay area, the Twin Cities, Portland, Oregon, and Boston, Massachusetts.