For the answer to that question, you will have to ask your union steward. For the union is responsible for regulating that aspect of employment in a union shop. It might also be mentioned in your Collective Bargaining Agreement. State law can't regulate overtime in this situation since you are a union member. Therefore, only federal law applies to the relationship between the union, its members (you and other fellow employees), and the employer.
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Mark B. Replogle