Police have warned of possible disruptions as thousands of construction workers across Australia are expected to down tools in support of the CFMEU.

Rallies are planned for the nation’s capital cities on Tuesday after Attorney-General Mark Dreyfus put the union into administration following allegations of links to organised crime and corruption.

However, striking workers risk having their pay docked if they walk off the job without permission, the Fair Work Ombudsman has warned.

In a statement, the FWO said the planned protests could be a breach of workplace laws.

“Where an employee has engaged in unprotected industrial action, the employer is required under the [Fair Work] Act to deduct a minimum of four hours wages from the employee, even if the industrial action was less than four hours,” it said.

Protesters in Canberra are expected to reach Parliament House at around 11am, the ABC reports.

Tensions between the CFMEU and the Albanese government have reached boiling point.

The CFMEU flagged it would launch a legal challenge of the takeover, saying members were denied due process and democratic rights.

The Electrical Trades Union and maritime union have backed the protest and urged members to join rallies, describing the federal government’s action as an “attack on trade unionists’ rights”.

In a social media post, the ETU slammed the treatment of the union in comparison to companies that weren’t placed into administration following royal commissions into banking and aged care.

“The CFMEU on the other hand — one of Australia’s strongest unions – is now forced straight into administration on the back of a handful of rumours and allegations,” the post reads.

“The hypocrisy is staggering!!”

A spokesperson for the CFMEU administrator said “the taking of unprotected industrial action is not lawful”.

“The CFMEU is no longer involved in organising any protest tomorrow,” they said.

More than 200 CFMEU officials were terminated after Dreyfus last week sent its construction and general divisions into administration, along with state and territory branches.

Any union property possessed by officials such as cars, mobile phones, laptops and documents could be taken.

The administration period could last up to five years. Officials found guilty of crimes would be banned for life and unable to become bargaining agents at other registered organisations without holding a fit-and-proper-person certificate.

Ex-CFMEU NSW secretary Darren Greenfield and his son Michael, a former union leader, will have their cases return to court in NSW over corruption charges.

The pair, who are on bail, are accused of accepting bribes from a building company for preferential treatment from the union and access to contracts.

-with AAP