American Postal Workers Union, also known as APWU, is one of the world's largest postal unions that represents more than 330,000 employees of the United States Postal Service. As an AFL-CIO affiliate, it operates clerk, maintenance, motor vehicle and support services divisions. The union also provides health care plan options. American Postal Workers Union is a national organization of employees that operates throughout the United States. It additionally represents employees from information service centers, mail equipment shops and operating services facilities. The union negotiates, interprets and enforces a national agreement with the postal service. American Postal Workers Union establishes wages, working conditions and other benefits for workers. It also protects workers' rights and offers membership opportunities.