The United Firefighters Union (UFU) has pulled out of the Victorian Trades Hall Council after being urged by other unions to rein in attacks on Labor MP Jane Garrett.

Key points: The United Firefighters Union has been accused by fellow unions of bullying Jane Garrett

The United Firefighters Union has been accused by fellow unions of bullying Jane Garrett Ms Garrett is planning to move to the Upper House in November's state election, but faces a legal challenge from a UFU member over her preselection

Ms Garrett is planning to move to the Upper House in November's state election, but faces a legal challenge from a UFU member over her preselection Trades Hall said it was rare for a union to leave the council, and the Opposition said the move shows the Premier is not in control

Ms Garrett, a former emergency services minister, has clashed with the UFU over what its secretary Peter Marshall called a campaign to undermine firefighters.

She claimed she was bullied by the union during negotiations in a bitter industrial dispute.

Mr Marshall also vehemently opposed her preselection into an Upper House seat ahead of Victoria's November state election.

Ms Garrett, the Member for Brunswick, is vacating that seat to contest the Upper House position, should she survive next week's Supreme Court challenge against her preselection. The challenge has been instigated by another UFU member.

The UFU's decision to step away from the state's peak body for labour organisations came as another union called for the "relentless bullying" of Ms Garrett to stop.

"This matter is one we as a movement, can no longer stay silent on," said secretary of the Rail, Tram and Bus Union (RTBU) Luba Grigorovitch.

"The RTBU has always maintained a working relationship with Peter and the UFU, but it's time that this relentless bullying and attacks come to an end."

The boss of the powerful Construction, Forestry, Maritime, Mining and Energy Union (CFMEU), John Setka, yesterday labelled the court challenge petty and said the bullying of Ms Garrett needed to end.

"What's happened to Jane is just totally unacceptable and I think people have just got to sort of sit around a room and really get over it," he said.

In July, CFMEU assistant secretary Shaun Reardon wrote to Premier Daniel Andrews, urging him to put an end to personal attacks on Ms Garrett.

"I implore you to stand strong on party matters with any undertone of misogyny or workplace bullying and to continue your outstanding work in relation to violence against women," his letter read.

Trades Hall said it was rare for a union to leave the council, particularly on political grounds, and said the move would have practical and symbolic consequences.

UFU secretary Peter Marshall has clashed with the former emergency services minister. ( ABC News: Stephanie Anderson )

'Out of control'

The Opposition's Emergency Services spokesman, Brad Battin, claimed the fallout was a sign the Premier had lost control.

"This is a straight out vote of no confidence in Daniel Andrews from the unions in Victoria, and most importantly, the union that's supported him which he's thrown everything at for your years," he said.

"Daniel Andrews has lost control of his own party. He's lost control of association with his unions.

"How can Victorians expect him to control crime, cost of living and things that are affecting their everyday lives?"

He said Mr Andrews had "never spoken up against the allegations of bullying against Jane Garrett" and has "failed to ever, ever condemn the issue with Peter Marshall".

"He's failed to mention Peter Marshall's name in Parliament ever to condemn what has happened with the United Fire fighters Union and condemn the issues of bullying and intimidation that have happened against his own party members."

Mr Andrews reaffirmed his support for Ms Garrett, but declined to speak about the UFU's move.

"I've got no comment to make about that," he said this morning.

"I answered some questions yesterday about those matters.

"Jane Garrett is a very important part of my team and she's going to do a great job in the Legislative Council.

"Beyond that, I'll leave others to run a commentary."

Mr Marshall has been contacted for comment, and has previously denied bullying allegations against him.