I say that who have created more damage to the mafia was Vito Genovese, for two important reasons:
1) The meeting of Apalachin where over 100 Italian, Sicilian or Italian-Americans mafiosi, in fact all the US family in the country, discovered by pure chance, a police officer of the area Edward Croswell was surprised to see so many Italian names in the register of hotels and noticed that the mobster Joe Barbara had ordered 95 kg of steak, 10 kg of slices of veal and 7 kg of salami;
with the following the raid and the arrest of several
the FBI awoke from his sleep and decided to hit the mob, but the damage could still be contained
2)Joe Valachi, Genovese believing that Valachi , had spoken to convict him, and tell ​​him that he would have whack him,
Valachi for the fearst of been killed, accidentally murder a thief with no ties with the Mafia, and risking the electric chair tipped everything he knew, 30 years in the Mafia,to the FBI.
After Valachi in 1970 was the RICO law,
''Under RICO, a person who is a member of an enterprise that has committed any two of 35 crimes—27 federal crimes and 8 state crimes—within a 10-year period can be charged with racketeering. Those found guilty of racketeering can be fined up to $25,000 and sentenced to 20 years in prison per racketeering count. In addition, the racketeer must forfeit all ill-gotten gains and interest in any business gained through a pattern of "racketeering activity." RICO also permits a private individual harmed by the actions of such an enterprise to file a civil suit; if successful, the individual can collect treble damages (damages in triple the amount of actual/compensatory damages).''