Bikers, who for some reason are known in Australia as "bikies", have carved out their own niche in the crime scape here. In fact they're bloody huge. The Outlaws, Bandidos and Hells Angels have Australian chapters, and there are heaps of local outlaw-biker clubs. Their large control of Australia's amphetamine trade is well known, and due to a difference in laws making it easier to obtain here, Australian Hells Angels were found to be shipping P2P to their Californian colleagues during the 90's.
I dont know if youd be interested, but here;s some info on Australian outlaw motorcycle clubs.

This is an Australian blog about some biker clubs in the Northern Territory
And one about the Rebels.
Heres a link to the Outlaw MC, Australia
One to the Gypsy Jokers , which is apparently under redevelopment but has some links open.

A Wikipedia link to an infamous gang-fight between Australian Bandidos and a splinter faction that came to be known as the Commancheros. At a swap meet, the gangs clashed leaving seven dead, six gangmembers and a completely innocent 14 year old girl.