Being from the city of Liverpool I feel obliged to respond to this.

Sure, there are notorious gangs or people from the city who are big time players not just in the UK but further abroad. Ties have been made, reportedly, to cartels in South America and the like. I'm not sure of too many others in the UK who have branched out that far.

Curtis Warren is the biggest name to spring to mind. Was and is an extremely intelligent man who made hundreds of millions. Currently incarcerated.

There have been about 25 fatal shootings in 6 or 7 years, and considering Liverpool isn't a massive city ( relatively so for the UK yes, compared to many other big cities in other countrie no ) then it seems alot.

It's a beautiful city to live in though, and like most places it's just a small minority.