 At the time, Calderone was also involved in the negotiations between Cosa Nostra and prince Junio Valerio Borghese who asked for support for his plans for a neo-fascist coup in return for a pardon of convicted mafiosi like Vincenzo Rimi and Luciano Leggio.According to Mafia turncoat Tommaso Buscetta the prince Borghese wanted a list with all mafiosi of Sicily.Calderone and Giuseppe Di Cristina went to Rome and met the prince Borghese.