MIAMI -- Protesters in downtown Miami on Tuesday demanded that Miami-Dade County commissioners ban the Wackenhut security company from any county contracts.

The protesters from the Service Employees International Union protested outside the county government building as commissioners were meeting inside.

The protest came after an NBC 6 investigation into a preliminary county audit of Wackenhut's contract. The investigation showed millions of dollars paid by county taxpayers to Wackenhut were unaccounted for.

"And on top of that, there are allegations of ghost posting -- empty posts, people not showing up, understaffing," one protestor said. "So, not only is it a question of safety, but also legitimacy with the taxpayer fraud."

The final Miami-Dade County audit of Wackenhut is not due for some time.