From Liverpool to London, violent organised crime gangs are taking an iron grip on the control of drugs and the streets as police forces become stretched.

Former Scotland Yard undercover detective Peter Bleksley lifts the lid on gangland Britain as he reveals which gangs are in control of Britain's biggest cities.

Watch as he outlines which gang controls London's drug trade, which set of criminals are dominating Liverpool and why everyone is terrified of Manchester's notorious criminals.

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