Absolutely, it's called hostile work environment grievance, and it can be made class action if others (even just ONE other) would step forward and echo your complaints (often they are afraid of standing alone, but will complain under the "shelter" of a herd or group). IF class action, those other 'sheep' don't have to personally risk the retaliation. A union rep will collect confidential statements from all who grieve, and there will be witness type verbal and written interviews for all involved to gather the story. So all who have issues can get their 2 cents in. And as Morty said, they may send in an EAP team to investigate, again taking interviews (EAP is a management response to the report of a problem environment). At least you will get the attention of the higher level managers at your district, so PM may watch their step for a while! Stay on it, don't just give up and say nothing will change. Because nothing will change if you drop it.