Billy Conn
Beginning his career as a professional boxer in 1934, Billy Conn had his last fight in 1948. Throughout his career, he had 77 fights and won 64 of them, 15 of which by KOs. Even outside of the ring he found himself in fights with people every now and again, but he used his strength and training to his advantage.
Emile Griffith
Having fought in 112 fights, Emile Griffith won 85 of them, 23 of which were by KOs. He began his professional boxing career in 1958, with his last fight being in 1976. After his retirement from boxing, he became a trainer.