Murdered bikie leader Zeljko Mitrovic’s steelfixing company raked in $11 million in nine months while associated with companies working on Queensland hospitals and high-rises.

The revelation has provided concrete evidence of organised crime infiltrating the building industry.

Mitrovic, who was shot dead in an internal gang dispute last year, infiltrated the industry after “standing over” the boss of one of the country’s biggest steelfixing businesses, Dennis Delic, former business associates claim.

Mr Delic, who died last month, signed a workplace agreement on behalf of Mitrovic’s company SFC Steelfixing QLD with the Queensland branch of the CFMEU on Christmas Eve 2010.

The company collapsed weeks later with a $1 million tax debt, no assets and no employees.

Local CFMEU boss David Hanna said Lend Lease, which was responsible for vetting subcontractors, notified the union that SFC was to work on the $1.9 billion Gold Coast University Hospital.

Mr Hanna said the union would not have known of Mitrovic or his crime links when it signed the agreement.

A Lend Lease spokeswoman rejected the union claims, saying the company had no record of direct deals with Mitrovic’s company.

But she confirmed Delic’s ISD Group worked on the hospital.

“As is standard practice in the construction industry, our subcontractors may, in turn, have commercial arrangements with other entities with whom we do not have direct dealings,” she said.

She said the company carried out “detailed checks on each entity” it directly dealt with before striking deals.

Mitrovic went on to found new Gold Coast and Brisbane City Hells Angels chapters, the latter as president, while still based in Sydney.

Mitrovic was a former Bandido whose brother-in-law was gunned down in an infamous triple murder in a Sydney pub by a Rebel and two associates in 1997.

Mitrovic himself was jailed over a double murder just a year later.