Li Causi furnished an explanation for the success of the left-wing block : Twelve days after the left-wing election victory , the May 1 labour parade in Portella della Ginestra was attacked , culminating in the killing of 11 people and the wounding of over thirty . The attack was attributed to the bandit and separatist leader Salvatore Giuliano , intending to capture Li Causi . Nevertheless , the Mafia was suspected of involvement in the Portella di Ginestra massacre and many other attacks on left-wing organisations and leaders . The massacre created a national scandal
Portella della Ginestra
Portella della Ginestra massacre
Girolamo Li Causi