Apart Joe Valachi and Tommaso Buscetta revealed that in USA and Italy the mafia exist, and that flooding with heroin the united states, the first gave evidence that there was a mafia in america twin of the Sicilian; the second in Italy proved that the Mafia really existed (until then there was no evidence).
Both forced the police to investigate against organized crime and to find ways to combat it.

After Valachi Hoover couldn't say again that American Cosa Nostra didn't exist.


Can say what informant was more damaging for a mob family ?

Aladena "Jimmy the Weasel" Fratianno,tried to bring back the Los Angeles family to its former glory and to become the boss, but Brooklier ordered to whack him and Fratianno flips. Was the most powerful mobster to become a federal witness until Sammy "the Bull" Gravano.

Carmen Zagaria ran a drug 15 million a year drug ring for the Cleveland family whren flips in 1983 with Angelo Lonardo the acting boss,gave the coup de grace to the family, that was already losing power because the two previous bosses,Scalish and Licavoli don't made new soldiers.

Angelo "Sonny" Mercurio,recorded a Cosa Nostra induction ceremony. His act led to the incarceration of family boss Raymond Patriarca, Jr. and other top family members.

Salvatore "Sammy the Bull" Gravano, when he flips half of the Gambino crime family capos was arrested.

Joseph Massino was the first boss of the American Mafia and even of the powerful NY five families to flips, perhaps had done more damage Vitale, Coppa, Lino etc but the fact that even if a boss,to avoid the death penalty or not to be sentenced, at the age of 60 years to life contributed to the loss of power and prestige of Cosa Nostra.