I'm with Ruk. It was COINTELPRO, government set-up. They did everything in their power to stop the panthers, all 'pac would have to have done would be make one song and the panthers could be back in full effect. He was popular enough to do it, and that scared the shit outta the government. I also think that prominent figures in the black community sided with the government, believing that 'pac was bringing a bad name to the black community, in much the same way as happened with Malcolm X (Farrakhan turned on Malcolm and co-operated with the goverment on his murder).