After doing some research, I have realized that Fat Tony has had three real names. I was referring to the name cited by Frankie the Squealer: Marion. However, the other two names he has had are Anthony D'Amico and William Williams. So I will accept rockzilla's answer, as it is correct. Derwood's was correct too, but I am going to chalk that up to a lucky guess.
Plus, if I gave it to Derwood, he wouldn't ask for a couple days and we'd stall again...
