American Postal Workers Union, AFL-CIO (APWU) The labor union that is the exclusive bargaining representative of all employees in the bargaining unit for which it has been recognized and certified at the national level. APWU members are in the following bargaining units: clerk, maintenance, material support, and motor vehicle. The Information Technology/Accounting Service Center bargaining… Continue reading American Postal Workers Union, AFL-CIO – USPS Definition