The Long Good Friday (1980)

Cockney gangster Harold Shand is on the brink of transforming his criminal empire into legitimate real estate ventures in late 1970s London. With aspirations of securing American Mafia funding to revitalize a rundown area for potential Olympic glory, Shand's plans are abruptly disrupted by a wave of bombings that threaten his operation. As the Americans arrive for crucial negotiations, Shand grows increasingly paranoid, suspecting betrayal from within his ranks. Determined to root out the traitor, he embarks on a ruthless quest for vengeance, showcasing the darker side of his ambition and power.