It was about ten years ago - riot at a Silky Jones fight, some guy got crushed by a bus as a direct result of gang violence (as in, gangs of people scrapping, not people wearing red and blue hankies).
http://news.bbc.co.uk/1/hi/uk/289194.stm
"A former world champion boxer is to retire following a riot at a title fight in which a man was murdered.
Paul "Silky" Jones said his deep sense of sadness following the death of 31-year-old Dean Fisher had convinced him to hang up his gloves.
Mr Fisher was killed when rioting broke out at the Oldham Sports Centre on Saturday night after Jones lost his Commonwealth middleweight title to Jason Mathews.
The father-of-two was crushed under the wheels of a coach while being attacked by a gang after the bout.
Boxer will never fight again
Jones, a former WBO light-middleweight champion from Sheffield, said: "It pushed me into it, I just thought I don't want any part of this.
"If this is what comes with boxing I'm out. I'll never fight again."
Meanwhile, Matthews, who had been friends with Mr Fisher since they were at school together, called for tighter security and a ban on alcohol in the sport.
He said: "Dean wasn't a violent person, he was pulled off the coach.
Call for tighter security
"I think they need to ban alcohol in boxing, full stop, because I think that played a big part in this.
"I think security needs to be tighter and also possibly the sales of tickets."
Police are continuing to investigate Mr Fisher's death, which they are treating as murder.
They are viewing more than 500 hours of tape from closed-circuit cameras covering the area around the murder in Lord Street in Oldham town centre. "
I don't know which set of fans it was, but I saw first hand that Matthews' fans were pretty handy - it very nearly kicked off at a show in Sheffield when he fought Darren Dorrington but luckily Matthews winning via stoppage seemed to placate them.
There was a huge fight at the 02 on the night of Haye/Macca, there were also maybe half a dozen other pretty violent fights too.
Who can forget the riot at the NEC while Benn/Giminez was going on?