They claimed to be “men of honour”. 　　In reality, they were killers in the Cosa Nostra (Sicily). 　　Arrested in the early 1990s, they chose to work with the Italian justice and obtained the status of “cooperative witness”. 　　Three of them tell their story: 　　how they joined the mafia, 　　what they experienced, 　　why they decided to betray the organisation and get out. 　　And in doing so, they b...