sentences:  The Corleonesi decided to dispose of key allies, starting with Rosario Riccobono, who was killed along with over twenty of his associates and friends in late 1982, and swiftly followed by Filippo Marchese, who was strangled and dissolved in acid like many of those who had died at his hands.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.