The Encrochat phone hack which has resulted in thousands of arrests and convictions across Europe has been described as a pinnacle moment in the fight against modern organised crime.
But how did police use the intel that they received every day over a three month period when they got a window into the business of crime.
Nicola speaks with Mobeen Azhar whose new BBC Gangster presents series Catching the Kingpins is the first behind the scenes look at how law enforcement eavesdropped on the criminals and how they juggled life and death decisions while attempting to keep them in the dark.
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