Former Victorian construction union boss John Setka has been expelled from the CFMEU.
The union's administrators have accused him of diverting more than $3 million of union funds to his companies.
Mr Setka told the ABC the allegations were "absolute lies" and he would be taking court action to appeal his expulsion.
Former Victorian CFMEU boss John Setka says an allegation from the union's administration that he misappropriated more than $3 million in member funds is "absolute bullshit" and he plans to appeal his expulsion.
In a statement his afternoon, the CFMEU's administration said it had expelled Mr Setka from the organisation after he had faced 27 disciplinary charges under union rules.
"An investigation by the CFMEU administration alleged Setka had failed in his duty as secretary of the union and diverted $3.3 million in revenue from union merchandise and site vending machines to his companies," union administrators said in a statement.
In the statement, CFMEU administrator Michael Crosby said the union would pursue Mr Setka in a bid to recover "the millions that his company has received".
"John Setka held a position of responsibility but abused that privilege to take millions of dollars from the members of the CFMEU," Mr Crosby alleged.
"John Setka's conduct is shameful. He has failed in the most basic duties of a union official…