Joe Masseria
Strong rivalries continued between various New York Mafia crime families and factions, the most heated rivalry being the one between Mineo's Manhattan-based allies in the Masseria crime family and those in the Brooklyn-based Castellammarese clan, a group of mafiosi from the Sicilian seaside town of Castellammare del Golfo, who rose to prominence during Prohibition and would become extremely independent and eventually oppose the dominance of boss Joe Masseria and his supporters such as Mineo. The rivalries and animosities between the two groups would eventually come to a head and a war within the Italian underworld would erupt and drag every Mafia crime family and faction in New York into the conflict.