In the shadowy world of crime and justice, informants play a pivotal role, often walking a tightrope between loyalty and betrayal. This curated list of 10 detective films delves into the complex lives of informants, showcasing their struggles, moral dilemmas, and the high stakes involved. Whether you're a fan of suspense, intricate plots, or character-driven narratives, these films offer a fascinating look at the underbelly of law enforcement and the personal costs of snitching. Get ready for a cinematic journey where every whisper could mean life or death.

Serpico (1973)
Description: Based on the true story of Frank Serpico, a New York City cop who went undercover to expose corruption within the police department, effectively becoming an informant against his own.
Fact: Al Pacino's performance earned him his first Academy Award nomination.


Donnie Brasco (1997)
Description: An FBI agent infiltrates the mafia, becoming close to a low-level mobster, all while feeding information back to his superiors. The film explores the psychological toll of being an informant.
Fact: Johnny Depp's character, Donnie Brasco, was based on real-life FBI agent Joseph D. Pistone.


The Insider (1999)
Description: A tobacco industry whistleblower becomes an informant, risking his life to expose the truth about the dangers of smoking, with a journalist fighting to get his story out.
Fact: Al Pacino and Russell Crowe both received Oscar nominations for their roles.


The Departed (2006)
Description: A tale of two moles, one in the police force and one in the mob, both trying to uncover each other's identity. This film is a masterclass in tension, with informants at the heart of the story.
Fact: Martin Scorsese won his first Best Director Oscar for this film. It's a remake of the Hong Kong film "Infernal Affairs."


State of Play (2009)
Description: A journalist uncovers a web of conspiracy involving a congressman, his murdered mistress, and a corporate informant. The film delves into the murky waters of political corruption.
Fact: The film is based on a British TV series of the same name.


The Town (2010)
Description: A bank robber's ex-girlfriend becomes an informant to help the FBI catch her former lover and his crew, leading to a tense game of cat and mouse.
Fact: Ben Affleck directed and starred in the film, which was shot on location in Boston.


The Whistleblower (2010)
Description: A Nebraska police officer uncovers a human trafficking ring in post-war Bosnia, becoming an informant to bring the perpetrators to justice.
Fact: The film is inspired by the experiences of Kathryn Bolkovac, a real-life whistleblower.


The Informant! (2009)
Description: Based on the true story of Mark Whitacre, an executive who becomes an informant for the FBI to expose price-fixing at his company, only for things to spiral out of control.
Fact: Matt Damon gained 30 pounds for the role to portray Whitacre's physical transformation.


The Company You Keep (2012)
Description: A former Weather Underground member, now a fugitive, must go on the run when a young journalist exposes his identity, forcing him to become an informant to clear his name.
Fact: Robert Redford directed and starred in this film, which also features a strong ensemble cast.


The Informer (2019)
Description: An ex-convict goes undercover to infiltrate a Polish drug ring, becoming an informant for the FBI, leading to a high-stakes game of survival and betrayal.
Fact: The film is based on the novel "Three Seconds" by Anders Roslund and Börge Hellström.
