 He needed to lend money to invest in heroin shipments.During the Second Mafia War — when the Corleonesi Mafia clan of Salvatore Riina and Bernardo Provenzano attacked the established Mafia families of Palermo — the Corleonesi killed Contorno's boss, Stefano Bontade, in April 1981.They went on to eliminate other members of the Santa Maria di Gesù family that were lured to the estate of Michele Greco where they were wiped out.