It's hard to know. The names that stand out are Sonny, Galante and Neil. All three men killed an enormous amount of people and displayed toughness that most people would never even dream of competing with. I don't believe there's ever been a man born who hasn't felt fear at least once in his lifetime, but some people are very good at keeping it at bay. Did Sonny Black feel fear when he went to that meeting? I'm sure he felt something. No man wants to be shot like a dog, but he handled it like a man.

But you had to play it cool, had to do it your way
Had to be a fool, had to throw it all away