sentences:  The Greco cousins were protagonists in a bloody Mafia war between rival clans in Palermo in the early 1960s – known as the First Mafia War, a second started in the early 1980s –, for the control of the profitable opportunities brought about by rapid urban growth and the illicit heroin trade to North America.The conflict was sparked by a quarrel over an underweight shipment of heroin and the murder of Calcedonio Di Pisa – an ally of the Greco's – in December 1962.The Greco’s suspected the brothers Salvatore and Angelo La Barbera of the attack.