In an exclusive interview with the ABC from his base in Malta, Rebels Motorcycle Club president Alex Vella said the cancellation of his visa on "character grounds" was a denial of natural justice.
"I'm innocent, I know that. I've done no wrong by nobody, but they've shut the door on me and thrown me out of the country," he told abc.net.au.
Law enforcement agencies have told the ABC that the stranding of Mr Vella in Malta has disrupted the Rebels and their operations.
Mr Vella, who held Australian residency for 47 years but not citizenship, was visiting Malta in June last year when his visa was cancelled "on the basis that the Minister reasonably suspected that Mr Vella did not pass the character test and was satisfied that the cancellation would be in the national interest".
Mr Vella has been the national president of the Rebels since 1973, presiding over a bikie club that has grown to be the biggest in the country with more than 2,000 members.
"Our crime is nothing more than a little percentage of what white collar people do," he said.
"[Bikies] get the blame for a majority of the crime committed in Australia, yet we make up 0.3 per cent of all crime committed," said his son Alex Vella Jnr, also a member of the Rebels, who spoke to the ABC while visiting his father in Malta.
But in Federal Court documents obtained by the ABC, the Government has alleged the Rebels are "high threat to the Australian community".
"Between January 2012 and June 2013, 718 Rebels MC members, nominees and associates were either reported or arrested in relation to 1,211 charges for offences ranging from violence-related offences (including serious assault, stalking, kidnapping and affray), firearms and weapons offences, drugs offences, and property, street and traffic offences.
"The Rebels MC have remained cohesive and disciplined through Mr Vella's strong leadership," the documents read.
Mr Vella and his legal team are seeking special leave before the High Court because they say the Rebels president has been denied natural justice under the Migration Act.
In March this year, Mr Vella appealed to the full bench of the Federal Court to set aside the Immigration Minister's decision.
Having lost twice in the Federal Court, Mr Vella's legal team now has one shot left to get the visa cancellation overturned and the Rebels boss back to Australia.
"It would be premature for me to say he's got good prospects or bad prospects, especially in light of the fact that we haven't even heard what the High Court wants to do," Peter Webb, one of Mr Vella's lawyers, said.
Mr Vella's wife Heather said the cost of failure for the family would be devastating.
"We'd be split. Australia is his home, that's where we all are - his kids, our grandkids, his mum. His mum is terrified that she's never going to see him again," she said.
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