I am a union employee. I made a formal complaint against a co-worker for slacking on the job, mocking and making verbal harassment toward other co-workers behind their backs. As a result, this problem co-worker has been moved to the other office where he is in close proximity to the Manager (our dept. has 2 offices, across from each other). Now, this problem co-worker has been, for 2 months, intentionally giving me an attitude whenever we are in a close distance from each other (of course, only when no one else is around to see it).