Union rules are found in the union's bylaws. The bylaws and the union constitution are the governing documents of the union, and they are individualized to the particular union. If there were any rule that prohibited the employer from disclosing your identity to the coworker, most likely it would be in the company's policies. I doubt any employer would agree to keep the identity of such a report confidential because the employer probably will not be able to investigate without revealing the source of the information.
One thing you may want to consider is that the bylaws of some unions contain a provision that prohibits one member from ratting out another. It's stated more politely, of course, but the general idea is that all union members should treat one another with respect. "Telling on" another union member can result in union sanctions against the one who spoke up.
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I could be wrong, but I think I already answered this question a few days ago. The guidance I provided then is still good guidance now. Report the conduct to your employer. While the prior conduct and the present conduct by this co-worker is not unlawful, it may be in violation of company policies about harassment in the workplace.
Telling the employee who made the complaint is not unlawful, and in some situations it is the right thing to do. For instance, if you go back and report this new conduct to the employer, the employer would likely tell the co-worker to lay off of you specifically or face further consequences.
As to the union, you can talk to your union representative, but this is likely not a union issue. It is a workplace harassment issue that should be handled by the company. Keep in mind that the union also represents this co-worker.
Good luck to you.
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