Do I have a case? My employer of 6yrs has been notorious for making offensive slurs and maintaining a hostile work environment.

Prior to my employer recently finding out I had info on a pending lawsuit from a former employee, I was told no chance to advance. None of my Black Co-workers have been able to get anyone hired into the company while every white co-worker has got 2 or more white family/friends hired. A former employee who is seeking damages shared she is willing to give a statement of his discriminating practices. I was given a promotion not for the all of the great innovative ideas and suggestions that have been put in use but FOR MY INSIDE INFO ON A LAWSUIT? I feel violated can I seek damages? From inappropriate jokes to racial comments would I be able to put a strong case together? On top of his discriminating practices that are far to many to name. Someone please help. I was asked to speak to the company lawyer and also to sign a conflict of interest agreement.(I declined to give a statement. What should I do help?