I started watching this TV show Gangs of London few days ago and I've been impressed with the plot. The level of gang activities in the TV show is intense. The battle of power, drugs, killings and betrayal is off the charts. 

If you haven't watched it, I would recommend it. 


https://m.youtube.com/watch?v=VoJ_yZqhmAg&pp=ygUPZ2FuZ3Mgb2YgbG9uZG9u