Syndicate Sadists, also known as Rambos Revenge and One Just Man in original Italian, Il giustiziere sfida la citt is a 1975 poliziotteschi film. This film by Umberto Lenzi, one of the directors many work in the crime thriller genre. It stars Joseph Cotten and Tomas Milian.
The film predates Ted Kotcheffs First Blood, the film which introduced audiences to the John Rambo of David Morrell by seven years. Tomas Milian happened to read David Morrells novel while flying from the U.S. to Rome. Loving the story he tried to talk some Italian producers into making a film out of it, with him starring as John Rambo. Nothing came of this, but he was allowed to use the Rambo moniker in the next poliziottesco he starred in.
Source: Wikipedia