For the first question, I think it's a combination of the two. He was never overly greedy and didn't demand anything out of his men except silence and loyalty. But on occasion, he could be ruthless, and didn't hesitate to have somebody offed on any manner of indiscretion. As for the second question, I would say "big stick". There's a reason he ruled the family for sixteen years (in the RICO era, too) before finally getting locked up.