A man has threatened an ABC journalist and cameraman saying he would "smash" them, in a confrontation outside a Melbourne printing business that has been linked to fraud allegations made in Parliament involving Labor MPs' printing budgets.

The Victorian Parliament is investigating after allegations were made in the Herald-Sun against unnamed government MPs of an elaborate rort of printing allowances.

Upper House president Bruce Atkinson said Parliament was looking at invoices and documents over the claims.

"If the article is accurate, then the allegations are deeply disturbing to me," Mr Atkinson told Parliament.

"If the allegations are true, they involve criminal actions and constitute fraud."

If those investigations uncover anything then the police or the state's anti-corruption watchdog would be involved, he said.

According to the newspaper, whistleblowers have accused a group of MPs and printing firms of ordering pamphlets, but only a few were printed and invoices were provided for a larger number.

The invoices were then sent to Parliament and the MPs were reimbursed under their office entitlements. The money was then being used to pay for memberships, to branch-stack in the western suburbs.

Former Liberal state director Damien Mantach is in prison over a similar scheme, in which he embezzled $1.5 million from the party's coffers.

Labor MPs are accused of rorting office invoicing entitlements. ( ABC News: Stephanie Anderson )

Matthew Guy's Opposition seized on the revelations to attack the Government, and used to parliamentary privilege to name F & M Printing and Upper House MP Khalil Eideh of being at the centre of the alleged scam.

"The Andrews Government is addicted to stealing public money,'' Mr Guy said.

"A fish rots from the head down. Daniel Andrews is responsible for this culture of stealing taxpayers' money."

Mr Eideh, who was not at Parliament, told the ABC that he was not involved. He said his office manager had told him that he had done everything in the proper way according to Parliament's laws.

When the ABC visited F & M Printing in Keilor East and asked to speak to the business owner, a man who said he was the owner of the property told the journalist and cameraman to leave in an expletive-laden rant.

"I want you to f*** off from here," the man said.

"I have got nothing to do with it.

"I will smash the camera. I will f****ing sue you c****.

"Get out of here, before I smash you. I don't give a f***."

The ABC crew was filming on a public footpath at the time.

Premier 'unaware' of alleged printing scheme

The allegations caused concern among Labor MPs and have provided the Opposition a lift after the damage done to the Coalition by revelations in an ABC-Fairfax investigation that Mr Guy shared a lobster dinner with alleged crime figure Tony Madafferi.

Premier Daniel Andrews said he was unaware of the scheme but urged anyone with any information about the allegations to contact authorities.

In a fiery question time, Mr Andrews hit out at Mr Guy, saying he would not be lectured on crime by a man who dined with alleged crime figures.

Greens leader Greg Barber said the police should investigate.

"These allegations, if proven, are quite simply criminal fraud. The president and the speaker need to call in the police, today, right now,'' he said.

F & M Printing earlier said it had no comment.