Chinese nationals who took part in former Wagga MP Daryl Maguire's cash-for-visas scam have started to see their immigration status revoked.
Two Riverina businesses have also been banned from a regional migration scheme for five years.
Senior Home Affairs staff told a Senate estimates hearing on Wednesday that they had contacted 20 immigrants allegedly involved in the scheme and cancelled five visas so far.
Deputy Commissioner for Australian Border Force Support, Justine Saunders, told the hearing that her agency made two referrals to the Commonwealth Director of Public Prosecutions.
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In October, Mr Maguire admitted to suggestions at ICAC that he committed a "breach of public trust" by involving his own constituents in a cash-for-visas "scam".
Riverina businesses were paid $30,000 cash or more plus reimbursed wages for every Chinese worker signed up to a job they rarely or never attended but used to create a pathway to Australian citizenship.
On Wednesday, Labor Senator Raff Ciccone asked the Australian Federal Police and Home Affairs for updates on investigations that involved Mr Maguire.
Commissioner Saunders said there was "quite an extensive investigation of the allegations in regard to the cash-for-visa claims".
"Whilst that investigation is ongoing I'm limited in what I can say, but certainly I can reassure the [Senate] committee that this matter is being taken very seriously," she said.
Ms Saunders said that in addition to two referrals to prosecutors, her agency was "compiling two additional briefs of evidence which we hope to refer ... in coming days".
Home Affairs Deputy Secretary of Immigration Andrew Kefford said six participants "have been issued with a notice of intention to consider cancellation" of visas and six were being considered for notices.
AFP Deputy Commissioner of Investigations Ian McCartney said the probe into a $30 million federal government purchase of 'Leppington triangle' land near Western Sydney Airport had found no link to Mr Maguire.
"We don't hold up Mr Maguire as a person of interest in relation to that aspect of the investigation," he said.
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