Unions negotiate contracts on behalf of all of their members. Unions must follow the language they negotiate on behalf of their members.
Union agreements or contracts are called collective bargaining agreements. They are enforceable contracts. The primary difference between a collective agreement and a private employment agreement is that the former covers many employees as opposed to a single worker with an employment contract.
Union contracts or agreements are overseen by the National Labor Relations Board for private unions. If your union is not following the terms of its agreement or engaging in some type of unfair labor practice you may reach out to the NLRB here:
Frequently Asked Questions - NLRB | National Labor Relations Board
You are not the only union employee experiencing issues at the present time. You should receive more attention now that the administration in D.C. has changed. Although you may have to exercise patience as the new administration will likely re-align the Board.
You may want to point out that you were essentially working at minimum wage rates with this union which seems a little odd. Hopefully your benefits package is very generous otherwise, why have a union at all?
Answered on Feb 12th, 2021 at 4:31 PM