Five Victorian unions have thrown their support behind the state's construction union boss John Setka, calling for decisions on his position to be left to members.
Victoria's manufacturing, electrical trades, rail and transport, plumbers and firefighters unions declared their support for Mr Setka on Tuesday, saying he should stay in his role unless his union members decide otherwise.
"Unions are democratic organisations who are answerable only to their members," ETU state secretary Troy Gray said in a statement.
"When you attack the members' right to choose their leadership, you are attacking the whole organisation and wider union movement."
Labor leader Anthony Albanese has moved to expel Mr Setka from the party over accusations he told colleagues anti-family violence campaigner Rosie Batty's advocacy has led to men having fewer rights.
Mr Setka has rejected the allegations.
The CFMMEU's hierarchy met in Canberra on Tuesday amid calls from the Victorian branch, of which Mr Setka is secretary, to make a public statement of its support for him.
The Victorians also want the union's national leadership to decry and forensically investigate the "cowardly manufactured leaks" from the previous national executive meeting where the comments about Ms Batty were allegedly made.
Victoria's CFMMEU has vowed to end all financial support to the ALP if Mr Setka is expelled from the party, and to cut ties with unions that have "attacked the branch".
Labor has received at least $11 million in donations from the CFMMEU nationally since 2000.
Mr Setka says Labor squandered millions of dollars during its unsuccessful federal election campaign and has vowed a long battle if Mr Albanese tries to expel him.
He is also threatening legal action.
Mr Setka is facing court later in June when he is expected to plead guilty to two criminal charges, including one of using a carriage service to harass a woman.
Senior Labor senator Penny Wong says Mr Albanese won't be rattled by the union.
"I don't know how well you know Mr Albanese but he's not somebody who responds well to being threatened," she told reporters in Adelaide on Tuesday.
ACTU secretary Sally McManus last week demanded Mr Setka resign as secretary of the Victorian CFMMEU with the leaders of the three largest unions - representing mainly female workforces - following suit.
The Australian Workers Union on Sunday backed them but called for proper processes to be followed.
Australian Chamber of Commerce and Industry CEO James Pearson has praised the union movement for standing up to Mr Setka.
"Bullying is a basic part of their business model and it is time that that stopped," he said.
Mr Pearson also believes union leaders should be held to the same level of account as the business sector, flagging support of proposed laws making it easier to disqualify rogue unions and officials.
Mr Albanese is standing his ground and appears unfazed by the possibility of losing money from the union, saying he makes decisions on merit and not from a funding perspective.
He said the party had received legal advice, which it acted upon, in terms of first suspending Mr Setka's membership before the expulsion process took its course.
It is understood while the ALP could expel him for bringing the party into disrepute, party rules set a high bar for expulsion over a "serious criminal offence" which needs to have attracted a sentence of five years or more.
Australian Associated Press