I think there are no nice gangsters in this world, but if I should choose somebody who at least seems nicer than the others, I would choose Harry Riccobene from the Philadelphia crime family. He seems a sort of Santa Claus or a gnome. On the photo on Wikipedia he doesn't look like that though, but on the others I found on internet and also in the documentaries about the Scarfo mob he seems just a nice old man. Somebody even said it was hard to put the word killer and Harry together, even when you knew who he was.

Willie Marfeo to Henry Tameleo:

1) "You people want a loaf of bread and you throw the crumbs back. Well, fuck you. I ain't closing down."

2) "Get out of here, old man. Go tell Raymond to go shit in his hat. We're not giving you anything."