According to the AMFA constitution, a member could be disciplined for supporting another union. Whether in office or not.
The term “discipline” as used in this article shall include, but not be limited to, fines, suspension, or expulsion from
membership, placing a member in bad standing (with consequent loss of the right to participate in union activities).
7. Acting in any manner to circumvent, defeat, or interfere with the collective bargaining between the Association and an employer with existing collective bargaining agreements
8. Acting in any manner that is against or derogatory to the best interests of the Association
Just one of the many reasons that could get you expelled as an amfa member. Grabbing a drink before a membership meeting or dropping an occasional F bomb during a meeting are two others.