Melbourne identity Mick Gatto has denied being involved in corrupt building industry dealings, saying the allegations are part of a witch hunt and a Liberal government agenda.
A joint ABC-Fairfax Media investigation has found union officials are making corrupt deals to help companies linked to organised crime secure construction contracts.
The report alleges a Comanchero bikie pays Mr Gatto to get his firm an agreement with the Victorian building union so it can work on building sites.
Victoria's desalination plant is among a number of projects that companies connected to major crime figures are reportedly involved in.
Mr Gatto said the report is wrong.
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"The only thing I will say is that they are all unfounded allegations," he told AAP on Tuesday.
"It's just a witch hunt. It is just an agenda for whatever the Liberal government want to do. That is all I can say. I've got nothing to hide."
Mr Gatto said he is the only high-profile Australian businessman being watched by authorities.
"100 per cent there is agenda there by somebody," he said.
"If I had done anything wrong I would be arrested, I guarantee that."
Mr Gatto denied he had been involved in corrupt dealings in the industry and rejected suggestions that the industry was corrupt.
"There has been no corrupt dealings whatsoever, never ever has, never ever will be," he said.
"They don't operate that way. Every company in Australia has got an EBA (Enterprise Bargaining Agreement). Anyone who wants to work in Victoria has got to have an EBA and they don't pay for it, they apply for it and it's open to everyone."
