I don't know if many, or any of yu have seen this movie, but it's pretty good.

Two Irish brothers from South Boston decide to fight crime vigilanty style. They basically take an oath to kill inherently bad people. It's done in a Pulp Fiction sort of back and forth (present and past) style. There is a lot of profanity and obviously it's very violent. Willam Dafoe and Sean Patrick Flannery head up the cast.