The Toronto local of the Labourers' International Union has reportedly asked police to investigate whether a private company, Construction Labour Force, is controlled by organized crime.
The union has a collective agreement with the firm.
The CBC's Fifth Estate and the Toronto Star have learned that the company, CLF, is tied to Cosimo Commisso; reputed boss of the Commisso crime family.
It was questions from both media outlets that prompted the Labourers International Union to ask police to investigate.
CLF provides workers to do general cleanup work at construction sites throughout the Greater Toronto Area.
The union typically gets job contracts with builders so it is unusual for it to have a collective agreement with the cleanup subcontractor.