The violence dragged on into the latter half of the 1980s as a result of the Corleonesi's treachery and desire to ensure their hegemony throughout the Mafia. Riccobono and Marchese were already eliminated by the start of 1983. Further murders followed, primarily involving Ciaculli killers Giuseppe Greco, Mario Prestifilippo and Vincenzo Puccio, and Agostino Marino Mannoia, who had switched sides from Bontade's to Riina's. These four men were invaluable to the Corleonesi throughout the first half of the 1980s, notching up literally hundreds of murders between them, but between 1985 and 1989 they were all murdered on the orders of the Corleonesi bosses, who saw them as having outlived their usefulness and/or perceived them as too ambitious and therefore a threat. Puccio's two brothers, also Mafiosi, were likewise killed.