Bouncers: Clubs and crime / Independent, 25 Feb 2007
http://news.independent.co.uk/uk/crime/article2302952.ece
Tony Thompson
"It's an open secret that some of the men who guard nightclubs use their jobs as cover for illegal activities. With the huge amounts of money at stake, there is little wonder that the criminal underworld won't let go of such a lucrative business. [..] A recent two-year academic study found that bouncers are becoming the main law enforcers in inner-city areas, with the police too stretched to cope with drunken louts."

Bouncers: violence and governance in the night time economy / Oxford University Press, 2005
Hobbs, R.; Hadfield, P.; Lister, S.; Winlow, S. .