From Wikipedia
In April 1977 Panthers were key supporters of the 504 Sit-ins, the longest of which was the 25-day occupation of the San Francisco Federal Building by over 120 people with disabilities. Panthers provided daily home-cooked meals in support of the protest’s eventual success, which eventually led to the Americans with Disabilities Act (ADA)thirteen years later.
I hope you didn’t think I was accusing the Black Panthers of anything!
I read your comment as insinuating only peaceful movements are successful, but I now realise there is another meaning to it.