Le clan des siciliens

The Sicilian Clan original French title Le clan des siciliens is a 1969 French crime film directed by Henri Verneuil and starring Jean Gabin, Lino Ventura and Alain Delon. The film was largely marketed by the casting together of three of the leading French movie actors of the day.

In Paris, bloodthirsty jewel thief Roger Sartet Alain Delon escapes from custody with the help of the Manalese, a smalltime but wellorganised Sicilian Mafia clan led by patriarch Vittorio Jean Gabin and which includes his sons Aldo Yves Lefebvre and Sergio Marc Porel and soninlaw Luigi Philippe Baronnet. While in prison, Sartet got to know an electrician Christian de Tillire who was involved in the setting up of an extensive security system at a diamond exhibition in Rome the electrician returned home early, unannounced, caught his wife in bed with a lover and shot them. Unaccustomed to prison life, he made friends with Sartet and bitbybit supplied him with details of the exhibition.Vittorio and a fellow Mafiose, Tony Nicosia Amedeo Nazzari of New York, go to the exhibition only to find that some changes have been made that make a simple robbery more difficult. Furthermore, the exhibition hall is just down the road from the local police station. Nicosia instead comes up with a plan to steal the diamonds while they are en route to another exhibition in New York and sends over Jack Sydney Chaplin, an alcoholic, in order to pass on the details. ........

Source: Wikipedia