who was the most ferocious?

[Taeth]

Sonny LIston.

[Mr140]

Well i dont know if Evander Holyfeild would be called ferocious but i tell you what he could be scary at times because man with no fear is a scary thing i mean never seen Holyfeild worried in the ring always the same look on his face even if you kicking the crap out of him just jumps right back in your face alot of then time coming back to win.