Disgraced former senior tax official Nick Petroulias gave sworn evidence to a parliamentary inquiry under a fake name, it has been alleged in State Parliament - and seven MPs sitting across the table never twigged.
The Greens are now demanding a formal inquiry into the circumstances surrounding the appearance at the inquiry into Crown land, held in August 2016.
Mr Petroulias' face was splashed across the country's media about eight years earlier, when he was imprisoned for corrupt conduct during his stint as assistant tax commissioner.
But in Parliament on Thursday, Greens MP David Shoebridge alleged that Mr Petroulias used the alias "Nicholas Peterson" to give sworn evidence before the upper house committee, of which Mr Shoebridge was a member.
If the allegations are proven, it will mean Mr Petroulias was able to pull the wool over the eyes of seven politicians, including inquiry chair Paul Green of the Christian Democrats.
Mr Shoebridge pointed out that in his verdict handed down in 2008, Justice Peter Johnson found Mr Petroulias had refused to acknowledge his "clear and gross wrongdoing" and "clear impropriety and deceit".
The standing committee was tasked with looking at a range of issues relating to Crown land in NSW, including Aboriginal involvement in its management.
"Mr Peterson" appeared before the committee with three other men who all identified as members of an organisation called "United Land Councils".
The organisation, they explained, was focused on the economic development of Aboriginal land by linking land councils across Australia and attracting "large-scale international and domestic investment".
Described as the organisation's "strategy and legals executive", Mr Peterson gave evidence about a property deal he was working up with an Aboriginal land council near Newcastle.
The same deal was the subject of a Fairfax Media special investigation last year. It is now being probed by the Independent Commission Against Corruption, which has been told that Mr Petroulias played a "central role" in the transaction.
At the inquiry, Liberal MP Catherine Cusack questioned Mr Peterson about his relationship to the land council, asking whether it was a "mediation role".
"Yes, we are trying to bring them together to try to get it on a massive scale," he said.
"Could you come back to us on notice as to which land councils in NSW are part of your organisation?" asked Liberal MP Scott Farlow.
"Sure," Mr Peterson replied.
The ICAC inquiry has separately heard that Mr Petroulias has gone by several names - including Nicholas Piers, Pearson and Peterson - since his release from prison.
Fairfax Media obtained bankruptcy forms from 2015 in which he described himself as a "disabled pensioner", with his debts estimated at an eye-watering $104 million.
