It's not exactly the same, because
> - yeah, but he can also cut you down in the street without due process, doesn't care about your opinion, and might enforce ius primae noctis, without any recourse.
If the mafioso goes too far they lose the support of the locals.
I mean, sure, the population has no recourse when some henchman rapes some bride, but the organisation's management usually enforce their rules on their own members rigourously and violently, too.
In the case of losing what little support they have with no profit involved, it's not hard to see why these organisations don't actually allow Droit De Signeur.
They're a business, first and foremost. Allow, even encourage, violence to increase profits? Sure! Use violence just for kicks? Probably not.