The bolded part.....

I have a basic understanding I think, but what the hell does " impute" mean? That they have to make it right?

Who are these " Sicilians"? The Rizzutos? Cuntreras? Are they referring to the Canadian Bonnanos? Or someone else?

As far as the Calabrians allied with the Sicilians, do they mean the Collucios, and maybe Bruzzese?