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.
They also were allied with groups of confederate rednecks with the understanding “we have incredibly different worldviews, but we’re both poor and it’s because of the rich folks in power”
The three-letter-agencies could not allow that kind of class consciousness so they assassinated Fred Hampton.