Per the constitution of the Michigan Postal Workers Union (ammended May 24, 2014), the duties of this position are:
Section 15. Auxiliary. The Auxiliary Chapter, a subordinate body to the Michigan Postal Workers Union, AFL-CIO, shall serve as a continuing link to the active State Union and Labor movement for APWU/MPWU families to provide family members the opportunity to participate in social, legislative, political, and educational activities to serve the needs of all active and retired members. The MPWU shall include information on its website and in the Michigan Messenger on a yearly basis to remind members and their family to join the Auxiliary.