Resurrection Man (1998)
Resurrection Man is a 1998 British film, directed by Marc Evans with a screenplay written by Eoin McNamee based on his novel of the same name. The story is loosely based on the real-life "Shankill Butchers", an Ulster loyalist gang in 1970s Belfast who conducted random killings of Catholic civilians until their leader, Lenny Murphy, was assassinated by a Provisional IRA hit squad.
More at Wikipedia.