I remember some years ago I read an article about Russian Mafia being a priority in Australia.
The Russian Mafia has a reputation for fearsome violence, but I don't know if they're prominent here in Australia. (I'm in Sydney.)
The biker gangs and Lebanese 'MEOC' get mentioned a lot around here. Southwest Sydney is crime hot-spot nowadays.
There's also quite a lot of crime amongst Aboriginals - Australia's indigenous people, but discussing it is 'politically incorrect'.
To the OP ("The Australian") I touched on the Australian mafia topic a few weeks ago - that would've been before you joined the boards; check out the activities of the Italian mafia (controlled by Robert "Aussie Bob" Trimbole) in the rural Australian town of Griffith (marijuana crops).
Griffith high-profile politician Don McKay got killed, probably by the Griffith Italian mob:
https://www.youtube.com/watch?v=ce0GbjOt0Wk and
https://www.youtube.com/watch?v=Dw3L0NIifDkAustralian-Italian mafia attack media news crews at Robert Trimbole's funeral:
https://www.youtube.com/watch?v=DX4O8rDVP5gI work in the media and I met Mark "Chopper" Read in 2008. He is from Melbourne and when I met him (here in Sydney) he seemed fearful, like he was in enemy territory. The two young bodyguard goons/associates with him looked paranoid, too. They were watching everything. Not a relaxed environment.
https://www.youtube.com/watch?v=Gnuk79z1MDcIn Australia, also watch the 'Underbelly' TV episodes. I don't know if they're available overseas. I've worked in the media for almost thirty years and I know a few of the cast and crew from those Underbelly shows. Shit, some of the episodes got filmed around my local streets in the dead of night.