New Zealand is said to have more gang members than soldiers. More than 5300 members or "prospects" are lining up to join one of 25 listed groups.
A recent article by The Economist quoted police saying gangs were a bigger force than the army, and organised criminal groups were thriving in rural areas as well as cities.
The Hell's Angels, Head Hunters, Nomads and Killer Beez all have a presence in New Zealand. Black Power and the Mongrel Mob have ruled the roost for almost half a century.
Gang members "stick out like dogs' balls", one member admitted to The Economist, because of their patches and tattoos. They are often clothed in leather jackets branded with clenched fists, bulldogs or the Nazi salute.
Police say three-quarters of the country's mobsters are Maori - despite the fact they make up just 15 per cent of the population. Many said they joined as much for whanau, as for money, power or thrills, The Economist said.