<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> 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>
who ordered the st valentine 's day massacre
who ordered the st valentine 's day massacre
allegedly planned by the organization led by Al Capone
allegedly planned by the organization led by Al Capone