Hundreds of CFMEU workers rallied at Adelaide’s Parliament House, while up to 8000 members gathered outside Melbourne’s Trades Hall as a rally got underway in the union’s hometown on Tuesday.

Wielding signs such as “Hands off the CFMEU” while dressed in hi-vis and work gear, protesters waved union flags as they shut down major roads around the CBD.

“When I say union, you say power,” they chanted.

In Sydney, more than 5000 union members shut down Macquarie Street outside the NSW Parliament, shouting “union power” and “f*** Albo”.

Deposed CFMEU NSW state secretary Darren Greenfield, who has denied allegations of corruption in court, attacked the peak trade union body, the ACTU, and its leader.

“Sally McManus is a sellout,” he said as boos rang out.

“We pay her to look after us and she sold us out for the Labor Party.”

In Brisbane, up to 5000 protesters flooded the CBD’s Queen’s Gardens forcing authorities to shut down nearby Elizabeth, George and William streets.

The action comes days after after the union was placed into administration by Attorney-General Mark Dreyfus, amid allegations of links to organised crime and corruption in the construction arm.

The protesters risk being fined by the industrial watchdog if they abandon work to take part in rallies, as the action is unprotected.

CFMEU members march in Adelaide on Tuesday. Photo: Claudia Dichiera/InDaily

In Brisbane, the marchers were addressed by federal Greens MP Max Chandler-Mather, who told them the government had established a blueprint on how to seize control of a civil movement or union.

“Labor has used these untested allegations to attack an entire union,” he said.

“You will be dismissed as radicals … but it’s not radical to believe that a construction worker should be afforded a fair trial like a CEO, banker or a politician.

“The real radicals are the Labor and Liberal politicians on untested allegations who are doing this as judge, jury and executioner.”

Queensland Electrical Trades Union secretary Peter Ong told protesters the Labor Party was not the union movement.

“This is the union, comrades,” he said, gesturing to the large crowd.

“This is not an attack on the CFMEU, this is an attack on the trade union movement … from what we thought was our own.”

In Melbourne, ETU state secretary Troy Gray said the size of the crowd reflected workers both inside and outside the CFMEU.

Maritime Union national secretary Paddy Crumlin spoke in Sydney, dubbing the government’s action a “massive busting up of unions”.

“This is an attack on every working man and woman,” he said.

A Fair Work Ombudsman spokesperson said if a site worker failed to turn up or walked off the job without permission on Tuesday, it could be a contravention of workplace laws.

Earlier on Tuesday, Federal Treasurer Jim Chalmers urged protesters to be peaceful despite their opposition to how the past week has unfolded.

– with AAP