Former New South Wales government ministers Eddie Obeid and Ian Macdonald are no longer members of the Labor Party.

Despite legal threats from former party powerbroker Mr Obeid, Labor's disputes committee ruled to expel the pair.

State Opposition leader John Robertson has confirmed both men were formally expelled two weeks ago for bringing the party into disrepute over allegations raised at the Independent Commission Against Corruption (ICAC).

Mr Robertson says while everyone remains transfixed by the ICAC, the pressing debates of state politics are gathering dust.

In a speech to be delivered today, he says he is hoping that will now change.

"Both these individuals have now been expelled from the party and the processes are concluded," he will say.

"What either of them may seek to do is a matter for them.

"My responsibility is to make sure that I clean up this show."

Mr Robertson is attempting to woo voters back to the party before the federal election in September.

While he admits the corruption inquiry is hitting Labor at the state level, he says it will not influence the outcome of the election.

But Mr Robertson's parliamentary colleague and former premier Nathan Rees told the ABC in March ICAC would be an electoral disaster.

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"At its most basic, I think you're looking at probably a three or four percentage point hit for the Federal Government now running into a poll in September," Mr Rees said at the time.

Mr Obeid has been accused of engaging in a criminal conspiracy with Mr Macdonald to defraud the state.

It is alleged that a mining licence was corruptly granted in the NSW Hunter Valley and that both men stood to make a lot of money from the deals - Mr Obeid as much as $100 million.

Both men maintain their innocence.

ICAC commissioner David Ipp is due to hand down his findings a month before the election.