Italian police have apparently recovered a Cosa Nostra version of the Ten Commandments which makes for very interesting reading. You owe it to yourself to read these things. These guys come off sounding like some teetotalers I know in OK, including this irony-free Tenth Commandment:
10. People who can't be part of Cosa Nostra: anyone who has a close relative in the police, anyone with a two-timing relative in the family, anyone who behaves badly and doesn't hold to moral values.