A police taskforce is still investigating possible criminal charges against union boss Michael Ravbar, nine months after a referral from the royal commission into trade unions.

Mr Ravbar, the state secretary of the Construction, Forestry, Mining and Energy Union (CFMEU), has given evidence at the inquiry hearings in Brisbane today.

The commission recommended charges of extortion against him relating to other matters in its interim report published in December.

The ABC has learned that the commission also wrote separately to the Queensland Director of Public Prosecutions soon afterwards, drawing its attention to the recommendation.

A Queensland DPP spokesman told the ABC it would not make any comment on the matter.

But the State Opposition received correspondence from the DPP in April, advising that the matter was still under investigation.

In the letter tabled in Parliament in May, then-DPP Tony Moynihan confirmed that the Commissioner of the royal commission had written to him and the Queensland Police.

"The Queensland Police Service is conducting a criminal investigation in relation to the information together with the Australian Federal Police," he said.

"I am waiting to be advised of the outcome of that investigation."

The royal commission's recommendation of extortion charges against Mr Ravbar related to alleged attempts to exclude certain contractors from worksites unless they made financial contributions to the union.

Last week Premier Annastacia Palaszczuk told parliament that the Labor Party had begun disciplinary action against former CFMEU president Dave Hanna.

He immediately resigned from the party.

It followed allegations in the royal commission that Mr Hanna had benefited from tens of thousands of dollars worth of free work on a house he had built for his family south of Brisbane in 2013.

But the party has not taken any action against Mr Ravbar, who sits on the ALP's national executive.

The State Opposition yesterday called on the Labor Party in Queensland to sever its ties with the CFMEU after further damaging allegations about union officials, including Mr Ravbar.

Ms Palaszczuk said yesterday the allegations emerging from the royal commission were "outrageous" but that she would wait to see the outcome before taking any action.

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