The majority of underworld crime figures and major incidents can be traced back to the Painters and Dockers Union that existed on Melbourne's waterfront after the Second World War. The Union had a Mafia-like structure, and most criminal activity was centred around control of the Union, and the cut associated with the drugs (primarily heroin and cocaine) that passed through the port. The Melbourne Markets were seen as a natural distribution point for these illegal substances (they were just across the road from the docks area).