Photo: Pontus Lundahl/TT

More and more professional criminals are joining so-called football firms. One reason is that criminals want to make money by selling drugs, while violence inside arenas is decreasing, reports Swedish Radio News.

?Some of those who are part of the firm-culture use violence as a way to exercise power, and this power can be combined with selling drugs. That combination can make an individual a lot of money,? says Aage Radmann, associate professor at Malmö University, who conducts research into football culture and hooliganism.

The police in Stockholm has appointed a special group to work with surveying so-called...