There are those out there that would likely say he killed many. The war on drugs etc. I personally wonder what he would have achieved if unconstrained, if he can do as much as he has while in prison.
I was thinking more along the lines of, "if he hadn't gone to prison, what would he have achieved."
I haven't read much about him, but if he was a dealer and trafficker in cocaine, I think there is a high probability that he would either be dead or not have accomplished much.