Employment Law Questions? Ask an Employment Lawyer.
You may be able to independently pursue a Family and Medical Leave Act claim against the employer. You are supposed to have 3 months leave and your job guaranteed upon return. But some labor contracts make all such claims subject to the contracts dispute resolution process. So the contract grievance process may be your only remedy, which would be rare, but possible due to Supreme Court precedent.
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You individually cannot file with the NLRB as the union is your exclusive agent in regard to labor relations. Nor is there a NLRB issue if the matter is strictly contract interpretation. The union could claim the employer is essentially ignoring the contract, which is an unfair labor practice, in terminating you but if there is any rational way the employer could interpret the agreement to allow termination then the union would lose that claim. Good luck with the matter in any event.