The Traitor (Italian: Il traditore) is a 2019 internationally co-produced biographical crime drama film co-written and directed by Marco Bellocchio, about the life of Tommaso Buscetta, the first Sicilian Mafia boss who was treated by some as pentito.

In the 1980s, the period of maximum power of the mafia clans in Italy, the Cosa Nostra of Palermo and Corleonesi factions (headed by Totò Riina), competing for the drug market, maintain a facade of friendship and collaboration.

Tommaso Buscetta (Pierfrancesco Favino), affiliated with Cosa Nostra and known as the "boss of two worlds", senses the imminent war between families and decides to move to Brazil, where he can follow his business in peace under the name of Roberto Felici.

Buscetta, who for some time no longer recognizes himself in the violent and unscrupulous actions of the Cosa Nostra and linked to an idea of the mafia that protects poor people, decides to accept, also to take revenge for the reprisals and persecutions against him and his family.

He thus becomes the first justice collaborator in Italian history, making possible the institution in 1986 of the Maxi-Trial with 475 defendants in the bunker-court of Palermo, where his testimonies - and those of Totuccio Contorno (Luigi Lo Cascio) - lead to the condemnation and arrest of numerous members of the mafia, put to the test for the first time and in the spotlight of the state and public opinion.