The raid, conducted on Monday, saw detectives from Victoria Police's specialist investigative units descend on the union's Melbourne offices. Five individuals were taken into custody, though their identities and the specific nature of the allegations have not yet been disclosed.
The operation marks a significant escalation in what authorities describe as an ongoing corruption probe. Police have declined to provide further details while the investigation remains active, but confirmed that evidence was seized during the search.
The CFMEU, one of Australia's most powerful trade unions, has faced increased scrutiny in recent years over workplace practices and governance. The union has previously denied allegations of widespread misconduct.
Victoria Police said the arrests are related to alleged corruption, but did not specify the offices or individuals involved. It is understood the investigation is being led by a dedicated taskforce, working in collaboration with the union's national office in Sydney.
The union has yet to make a formal statement, but sources close to the organization indicate that legal proceedings are expected to follow. The CFMEU's leadership in Melbourne is believed to have been informed of the raid and arrests.
This is a developing story. More details will be published as they become available.