<P> The victims included five members of George "Bugs" Moran's North Side Gang . Moran's second - in - command and brother - in - law, Albert Kachellek (alias James Clark), was killed along with Adam Heyer, the gang's bookkeeper and business manager, Albert Weinshank, who managed several cleaning and dyeing operations for Moran, and gang enforcers Frank Gusenberg and Peter Gusenberg . Two collaborators were also shot: Reinhardt H. Schwimmer, a former optician turned gambler and gang associate, and John May, an occasional mechanic for the Moran gang . </P> <P> When real Chicago police officers arrived at the scene, one of the victims, Frank Gusenberg was still alive . He was taken to the hospital, where doctors stabilized him for a short time . Police tried to question Gusenberg . When asked who shot him, Gusenberg, who had sustained fourteen bullet wounds, replied "No one shot me ." He died three hours later . </P> <P> The massacre was allegedly planned by the organization led by Al Capone to eliminate George "Bugs" Moran, the boss of the long - established North Side Gang . The former boss of the North Side Gang, Dean O'Banion, had been murdered by four gunmen in his flower shop on North State Street in 1924 . After the murder of O'Banion, each successive leader of the North Siders was also killed, allegedly by various members or associates of the Capone organization . </P> <P> Several factors contributed to the timing of the plan to kill George "Bugs" Moran . Earlier in the year, North Sider Frank Gusenberg and his brother Peter unsuccessfully attempted to murder Jack McGurn . The North Side Gang was complicit in the murders of Pasqualino "Patsy" Lolordo and Antonio "The Scourge" Lombardo . Both had been presidents of the Unione Siciliana, the local Mafia, and close associates of Capone . Moran and Capone had been vying for control of the lucrative Chicago bootlegging trade, and Bugs Moran had been moving in on several of Capone's enterprises . Moran was muscling in on a Capone - run dog track in the Chicago suburbs and he had taken over several saloons that were run by Capone, insisting they were in his territory . </P>

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