“This is what killed the mafia.”
The FBI disagrees that the mafia has been killed:
‘the mob has shown itself to be resilient and persistent. Arresting and convicting the hierarchies of the five families several times over has not eradicated the problem. [...] Even more of a myth is the notion that the mob is a thing of the past; that La Cosa Nostra is a shadow of its former self. [...] we also know that when a boss or underboss goes away for a time, that vacancy is filled with an acting boss or underboss.’ - FBI Assistant Director Janice K. Fedarcyk (https://archives.fbi.gov/archives/newyork/press-releases/2011/statement-by-assistant-director-in-charge-janice-k.-fedarcyk)
The FBI doesn't like competition.