The Oath (2018)

Police officer Tom Hammond lives a double life. Guardian of the law - the leader of the brutal criminal group "Crows", consisting of police officers. But the punishment is inevitable: the criminal agent of the FBI, who works undercover, will recognize Hammond's criminal activities. The case comes to trial, and the former cop goes to prison after receiving a long term. But Hammond does not lose hope to go free and again become the leader of the gang, taking revenge on all who betrayed him.