In what movies has Robert De Niro portrayed a policeman?

* The Gang That Couldn't Shoot Straight (1971)

* Mean Streets (1973)

* Taxi Driver (1976)

* New York, New York (1977)

* Raging Bull (1980)

* The Mission (1986)

* The Untouchables (1987)

* Cape Fear (1991)

* Cop Land (1997)

* 15 Minutes (2001)

* Righteous Kill (2008)