The American Postal Workers Union, also known as APWU, is one of the world's largest postal unions. It represents more than 300,000 employees and retirees, as well as over 1,000 private sector mail workers. The union operates clerk, maintenance, motor vehicle and support services divisions. The American Postal Workers Union s affiliate organizations include the Postal Press Association and Members-at-Large. It operates a maintenance division that has a staff of nearly 40,000 individuals. The union s industrial relations department improves working conditions and benefits. In addition, the American Postal Workers Union offers flexible spending accounts and health plans. It is an affiliated organization of the American Federation of Labor - Congress of Industrial Organizations.