It seems to me that he created a toxic work environment - especially for women, and got away with it because of seniority and it seems having narcissistic personality traits.
It is illegal to sexually harass women in the workplace. Gather all the evidence you have and send it to the district attorney and he will be given a fair trial at a court of law.
Ok, he will have a fair trial in a civil court. You just have to convince the alleged victims to sue for damages. If the case has merits, it will be decided upon the available evidence.
