Fred Hampton. They got his head of security to drug him, then came in on him with his pregnant girlfriend asleep next to him and murdered him. His tombstone is all shot up, because cops go there to shoot at it.

He was the Illinois chairman of the black panther party, and his focus was bringing all races together to fight economic injustice. That, and educating everyone about the class warfare being waged by the extraction class.

Edit: typo