This taught thriller is anchored by a terrific central performance from Harrelson, who alternates between fury and panic throughout the film. The actor won his second Oscar nomination for his work in Moverman’s previous film, The Messenger, but Rampart also benefits from one heck of a supporting cast, including Sigourney Weaver, Steve Buscemi, Robin Wright, Anne Heche, Ben Foster, Jon Bernthal, Brie Larson and Ned Beatty. It’s also scripted by legendary crime author James Ellroy (L.A. Confidential), who brings the seedier side of the city to life in a way that feels authentic.

Perhaps the most shocking aspect of the films is that it’s based on real-life events. Rampart really did exist, and its anti-gang unit CRASH really did plant evidence, murder suspects and steal drugs. A number of officers were eventually found guilty and the city of Los Angeles was sued by the families of the victims to the tune of around $125 million. There are even rumours that CRASH officers were involved in the death of rapper The Notorious B.I.G.

It’s a shameful chapter in the LAPD’s history, but makes for a truly fascinating film in which the weight of the investigation closing in around Brown feels tangible. If you’re looking for a study on the corrosive effects of police corruption, you’d be mad to miss this.