By itself, a supervisor being negligent or abusive is not illegal. More facts need to be specified before any attorney can suggest that you may have been victim to unlawful conduct.
Not legal advice / No lawyer/client relationship.
Unless your union agreement provides otherwise, HR is not required to make any response to a complaining employee except in very limited circumstances where the complaint raises very specifically-defined issues of unlawful discrimination based on a protected characteristic such as race, gender, religion, etc. Ordinarily complaints about a manger's abusive behavior and lack of skill in supervising will not trigger any legal obligations by HR unless the allegations are grounded in the protected characteristics, such as where the complaint is that the abusive behavior directed at the employee who is in a protected classification.
Where HR does not have a legal obligation to respond, based on the limitations described above, the employee is not protected against termination or other adverse employment action based on the complaints to HR. Few employers will tolerate an employee who is at loggerheads with a manager if the employer chooses to keep the manager. Prepare.
Your post suggests that you are represented by a union. Reach out to your union rep -- your union is your best and likely only recourse here.
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