They're widely considered to be the most deadly gang operating in the UK and Ireland. Their fearsome reputation puts them on a par with the Italian mafia and the Mexican cartels.
The Kinahan Irish crime family are rumoured to have made around £850m from drugs, firearms and extortion rackets. They're thought to have murdered at least 20 people around Europe.
And now a new documentary The Celtic Cartel – released on Amazon Prime this week – explores how the Kinahan clan rose to the top of the global drug trade.