 Through his Mafia boss allies Magaddino and Gaspar Milazzo , Aiello arranged a meeting with Joe Masseria , the capo di tutti capi based in New York City , seeking support in Aiello 's efforts against Capone . During the meeting Masseria offered to support Aiello in exchange for control of the east side of Chicago , which would allow Aiello to keep the city 's west side . The offer infuriated Aiello , who threatened Masseria and ordered him to leave the city . In turn , Masseria spread false rumors that Aiello attempted to kill Masseria , giving him a pretext to support Capone in retaliation . Mafioso Joseph Bonanno later described as a key incident in starting the Castellammarese War in New York City . Masseria openly supported Capone , requiring a strong alliance with him following the death of Masseria ally Giuseppe Morello . He also offered territory to Milazzo if he betrayed Aiello , an offer Milazzo rebuffed and considered insulting . As a result , Aiello backed Salvatore Maranzano in the Castellammarese War , providing the Maranzano forces with $ 5 @,@ 000 a week for their war chest . 
