Federal police have raided the Brisbane office of the Construction, Forestry, Mining and Energy Union on Thursday morning.
More than 20 Australian Federal Police officers began searching the Bowen Hills offices at 7am, a move the powerful union has slammed as a "political witch hunt". 
The officers are reportedly searching for proof that CFMEU heavyweights Michael Ravbar and Dave Hanna destroyed seven tonnes of union documents in   April 2014, allegations that emerged in the Trade Unions Royal Commission hearing in Brisbane in   September. 
Mr Hanna is a former national CFMEU president, while Mr Ravbar is the union's Queensland secretary.
If proven, the document burning allegations could result in the pair facing criminal charges across three jurisdictions, the Queensland Criminal Code, the Commonwealth Crimes Act and Commonwealth Royal Commission Act.
Each man could face up to seven years in jail.
The Australian Federal Police confirmed on Thursday they had obtained a warrant to search the Bowen Hills offices.
"The AFP can confirm it is executing a search warrant in Bowen Hills," it said in a statement.
"This activity relates to an ongoing investigation."
AFP raiding CFMEU headquarters in #Brisbane ... Mustn't be much water inside ... pic.twitter.com/W2HIvNnabL
??? Melissa Grant (@mel_grant)      November 19, 2015
The Royal Commission is investigating union corruption across Australia.
Dave Noonan, the national secretary of the CFMEU's construction division, attacked the raids as a "wasteful, aggressive" use of AFP time.
"We respect the important work of the police in protecting the community but challenge the legitimacy of this operation, given that their resources could be better utilised elsewhere," he said. 
 "At a time when the world is on heightened terror alert, while our communities require protection from drug dealers and organised crime, it is a disgrace that scarce police resources are being wasted on attacking workers and unions."
"It is unacceptable for the federal government to be using the federal police to execute the political agenda of the Liberal party."  
"The same thing happened in Canberra and it is nothing but a show for the media. We have nothing to hide and have fully complied with our obligations to produce documents."
At its   September sittings, the Royal Commission heard that staff at the CFMEU's Bowen Hills removed a "large number of documents" on   April 1, 2014, during which cameras in the office were covered.
Both Mr Hanna and Mr Ravbar denied seeing the notice to produce evidence - which was emailed at 4.16pm on   April 1, 2014 - until at least the following day, and insisted nothing of relevance was thrown out anyway.
Mr Hanna and Mr Ravbar testified at the commission last month and blamed each other for trying to cover up the destruction of the material.
Training coordinator Bob Williams told the commission some of the documents were placed in a horse float and taken to Mr Hanna's property in Logan.
The Royal Commission heard that Mr Hanna and Mr Williams tried to set the files alight, but gave up after spending two hours attempting to burn 10 boxes.
Mr Hanna was a one-time factional powerbroker in the Labor Party who was forced to resign in the wake of revelations at the Royal Commission's Brisbane sittings, ahead of disciplinary action launched by the party executive.
Mr Hanna was one of the most powerful faction leaders within Queensland Labor.
Further allegations of corruption levelled at Mr Hanna at the Royal Commission included that he procured funds from two subcontractors to help pay for the cost of IVF treatment for another organiser and work carried out on his Brisbane home was billed to a shopping centre developer.
Mr Hanna resigned as Queensland and national president of the CFMEU in   August, prior to the Royal Commission's Brisbane hearings, citing health reasons.
-With Kristian Silva, Amy Remeikis and AAP
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