sentences:  Gradually, the bosses of Palermo and their men were isolated.On 23 April 1981, Bontade was machine-gunned to death, and a few weeks later, on 11 May Inzerillo was killed in a hail of bullets.Various relatives and associates of the pair were subsequently killed or vanished without trace, including Inzerillo's 15-year-old son, who was killed for vowing to avenge his murdered father.