I am a Shop Stewert for a large company. I had a violation and was treated harsher then others with the same violation. Is this retaliation?

I am a Shop Stewart for a large company. I had a violation and was treated harsher then others with the same violation. Is this retaliation?

We have a new boss for a year and a half who has created a hostile work environment. As a Shop Stewart I have filled grievances on behalf of our Union Brothers and Sisters on our boss’s treatment of employees and the hostile work environment he has created.

Recently I had 2 violations in one day, we were very busy and I asked my boss for help. He told me that he could not justify paying overtime with the current work flow. Normally we would have 3 employees in that situation, instead of the two. Where others have made mistakes and nothing was done, I was given a formal written letter in my file.

If he is treating me differently, is this retaliation or harassment because I am Shop Stewart and have brought to light his treatment of employees?

Thanks