The NSW government has come under fire for awarding multi-million dollar contracts to a construction firm whose directors allegedly failed to pay their sub-contractors.

Months before Keystone Projects Group went into liquidation last year, two of its shareholders, Paul and Chris Burton, were awarded road contracts under their other construction company, Burton Contractors.

Opposition Leader Luke Foley said it was unacceptable the government was currently paying the directors of a company that left a string of workers out of pocket when it went under.

“It’s just not acceptable in our state that you can do a runner, put a company into liquidation and receive hundreds of millions of dollars in government contracts,” he told reporters in Sydney.

“Our workers in construction and other industries deserve a bit of justice,” he said.