Threats of violence and actual violence are prohibited, as are extreme profanity, name calling, and personal attacks. Actions barred by your contract are not protected, either. The boss is not allowed to use discipline, either real or threatened, or any other form of intimidation to discourage you from doing your job. For example, you can't be denied overtime opportunities, promotions, job transfers, bumping rights, or any other entitlement as punishment for doing an aggressive job. Nor can management assign you to the most undesirable jobs or more closely supervise you than other workers.
Some supervisors try to hold stewards to higher standards than others.
This is illegal, too. The time limit for filing a ULP charge is within six months of the violation. Contact your UE staff member before filing an Unfair Labor Practice charge with the Labor Board. But, if you feel that a ULP charge should be filed, talk with your UE Field Organizer and local officers about the best way to proceed.