Mental harassment by top official

I work as an assistant manager in a PSU. I belong to a backward caste. I have given my 25 years of service in a place dominated by a particular higher caste. Being dear to the fellow employees I have won officers union election consecutively for 3 years. Things started to become worse when one of the higher official (DGM) who has always been in a disagreement with me became frustrated with the fact of his dear ones belonging to the same higher caste are unable to win the elections. Soon he resorted to threatenings "if you don't follow my instructions i'll get you in big trouble" . Then after threatening alot of employees junior to him to cast their votes to his candidate or else he'll get them chargesheeted. his candidate won the election and later he got me chargesheeted via company authority in a weird case for negligence in work which everyone including the management knows is a actually not an issue at all. Now even the management is forcefully working under his instructions and carrying the disciplinary case against me ignoring my words. This has caused alot pain and mental agony to me. The decision on the disciplinary case is yet to come. What are the legal remedies.