Giuseppe "Pino" Greco enough said

During the Second Mafia War from 1981 until 1983, orchestrated by the Corleonesi, Giuseppe Greco carried out dozens of murders, often with his favourite weapon, an AK-47. He was eventually convicted in absentia of 58 murders, most of them committed during the early 1980s, but it is believed he committed at least 80 murders in total[2] and possibly as many as 300.

Amongst those he gunned down are Stefano Bontade, Salvatore Inzerillo, Pio La Torre and Carabinieri General Carlo Alberto Dalla Chiesa. He even murdered Inzerillo's fifteen-year-old son after the youth vowed to avenge his dead father. Greco is rumoured to have chopped the boy's arm off before killing him and dissolving his corpse in acid.