CCTV footage from a violent brawl between the Finks and Hells Angels at a boxing match on the Gold Coast in 2006.

IT could be a bikie war like nothing ever encountered in this country before.

The two rivals are deadly enemies.

One gang is known for its "deviant sex acts" and the other for its racial intolerance.

Almost 30 years on from when rival gangs clashed in the Father's Day massacre in western Sydney, police say two outlaw clubs are destined to clash in a deadly turf war.

The Mongols and the Hells Angels have a club rule to shoot each other on sight, and when they have encountered each other on the streets of California and other US states, things have turned bloody.

And with access to modern semiautomatic assault weapons, many more people than the one civilian and six bikies who died at Milperra in Sydney in 1984 could be caught in the crossfire.

Police have told news.com.au the arrival of the Mongols outlaw motorcycle gang on the Australian continent where the Hells Angels have ruled for decades can only mean one thing: the outbreak of war.

"It's only a matter of time," said Detective Steve Cook.

"There's far too much hatred between the two organisations for them to set it aside.

"The Hells Angels were the baddest of the bad, and then along came the Mongols.

"If anything, it's only gotten worse and it's a matter of pride."

Detective Cook, a specialist bikie gang investigator from the US midwest, has a unique insight into outlaw gangs and their spread internationally.

"The Mongols are the most powerful now, the Hells Angels [in America] ... would probably be on the phone right now to the hierarchy of the Hells Angels in Australia saying what in the world is going on over there," he told news.com.au.

"What are you going to do? Are you going to just sit there and go from being the dominant organisation to being second fiddle to the Mongols?"

A longtime outlaw bikie gang investigator based in Australia confirmed police in the states where the Mongols have "opened for business" are watching and gathering intelligence to "be ready" for when conflict breaks out.

"We are talking with our contacts in the [United] States to get as good a picture about what might happen," he said.

"But to be truthful, it might just be a matter of an accidental meeting of the Mongols and the Angels and things will turn bad.

"That is what has happened over there and it's just unfortunate if you are a member of the public who is in the wrong place at the wrong time.

"I don't think most members of the Mongols or the Hells Angels even remember why they have to shoot each other sight, it's just a natural thing for the hatred is so ingrained."

Apart from both gangs' involvement in organised crime - drug deals, gun running, extortion, murder and fraud - the two clubs have earned distinctive reputations.

The Mongols - club logo, a bikie with a Fu-Man Chu moustache holding a sword and wearing a combat ribbon - are America's most infamous gang.

Their appetite for violence documented in a grand jury indictment by the US Bureau of Alcohol, Tobacco, Firearms and Explosives, includes kidnapping, stabbing and torture of suspected "enemies".

The Mongols also consider women "property" and their initiation rites include bizarre sexual practices to earn their "wings" and progress from "prospect" or probationary status to fully fledged member.

These include intercourse with a menstruating woman, a woman with a sexually transmitted disease and necrophilia (sex with a corpse).

The Hells Angels - logo, a winged death head - have staunchly refused membership to African Americans and Hispanics in the US, although Australians of Lebanese and Islander background are known to be members in the gang's chapters here.

The enmity between the Hells Angels and Finks outlaw clubs in Australia "made it a natural fit" for the Finks to have patched over to the Mongols over the last month.

This now means the Hells Angels and the Mongols are "about evenly matched numbers wise", with up to 400 members each.

They are the most dominant clubs among the 40-plus outlaw and other bike gangs in Australia.

"There are standing orders in both clubs, and they do take their orders from their mother chapters in the States, that whenever they see each other 'you drop your shit and get it on'," the Australian detective said.

"And if you can't shoot, you get in a fight and they are probably carrying knives.

"It's the honour of the patch and it starts with 'you can get f---ed' and then, 'no, I told you get f---ed'.

"This has been proven to happen again and again, like in a schoolyard, except with weapons, and it can happen here."

As far as hatred among the one per center clubs went, it "doesn't get much worse" than between these two gangs.

"When the Mongols started wearing 'California' on the bottom rocker [the lower third of their three-piece jacket patch] that was a huge point of contention because the Angels 'owned' California," he said.

"For a Hells Angel, going out and shooting a Mongol is like you and me getting up in the morning."

Legendary clashes of the rival gangs

2002: the Ultimate Fighting Match riot

At an Ultimate Fighting Match at the Morongo Casino in Cabazon, people were attacked with knives and chairs as Mongols members began kicking victims with steel-toed boots.

April 2002: the Laughlin River Run riot

In 2002, while on an annual ride through the state of Nevada, members of the Mongols and the Hells Angels clashed at Harrah's Casino, Laughlin, in a confrontation that left three bikies dead and 12 people wounded.

Hells Angels stabbed Mongol Anthony "Bronson" Barrera, 43, to death, and two Angels, Jeramie Bell, 27, and Robert Tumelty, 50, were shot dead.

Hells Angels afterwards sneered at video which showed the Mongols president "running like a coward" as the fighting began "leaving his club brothers to be shot, stabbed, and in one case killed".

2005: the Toys for Tots charity shooting

Six Mongols were charged with a shooting at a Toys for Tots charity drive in Norco, California that injured three people, including a local firefighter.

The Mongols opened fire after a fistfight with rival Hells Angels members attending the event at the Maverick Steakhouse.

March 2006: Gold Coast Ballroom Blitz

Said to be sparked by the gang defection of Christopher Hudson - who later became known for shooting two people dead in Melbourne's CBD in 2007 - this fight broke out at a kickboxing match in the packed grand ballroom of the Royal Pines resort at Carrara on March 18, 2006.

Hudson, 30, had been sitting at a ringside table with Hells Angels bikies among a crowd of 1800 when the Finks arrived.

About 10.30pm, a Fink approached the table, shouting abuse at Hudson including: "Come on c---, let's f----ing go" before punching him in the side of the head.

Dramatic television camera footage showed a melee quickly erupting, with chairs and glasses thrown and tables overturned.

Gunshots could then be heard.

A Fink shot Hudson in the face with a handgun he'd had concealed in his pants.

After being shot, the burly bikie was pinned to the edge of the boxing ring while several people continued to punch him.

He could be seen trying to crawl away on all fours before being dragged back and struck with a glass from a nearby table.

Hudson later showed up at hospital with cuts and gunshot wounds, including a hole in his chin where the bullet had entered and exited through his jaw.

December, 2008: the Las Vegas wedding chapel riot

Only a few months after the murder by a Mongol of San Francisco Hells Angels President Mark "Papa" Guardado, the Angels turned up at the Special Memory wedding chapel in Las Vegas for the marriage of one of their prospects (trainee members), only to discover a Mongols wedding was scheduled for later in the day.

The brawl broke out in the lobby and moved outside onto the lawn.

Crime scene photos showed blood on the floor and doorways, broken and bloodstained items, and a small zipper pouch containing drugs that was left near a chapel pew.

Firearms were also impounded at the scene.

August, 2011: the Sturgis Motorcycle Rally fight

The annual Sturgis Motorccyle rally in South Dakota is usually "rivalry neutral" zone for bike lovers, but on this occasion Mongols and Hells Angels couldn't hold back.

Members of the public heard popping noises and watched members of the gangs engage in a melee.

Video of the scene shows the Sturgis Police at the scene, guns drawn and women emerging from the Hells Angels' clubhouse with their hands over their heads.

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