Not sure that any US mobster was anywhere close to Riina's guys in Italy. They blew up part of a highway to kill one magistrate, detonated another bomb to kill another magistrate, kidnapped one of Inzerillo's kids, cut his arm off and shot him in the head, kidnapped a rat's kid, strangled him to death and disolved his body in a vat of acid, among many other atrocities committed during Riiina's time in power. No US mobster would ever dream of doing any of the things that they did, not even Scarpa and DeMeo, as crazy and demented as they were.
Riina and his crew from the Leggio days are the sickest LCN to ever live.
Even the cartels were afraid of them. Don Badalamente moved to SA and even his allies were scared of Riina
My family has known the Inzerllio's for decades, an incredibly tough family, even they were smart enough to flee from Riina.
