"Allegations of some overseas players entering into Australia and running a malicious campaign with elements of possibly violent past are very concerning to us."
12 countries including China, Pakistan, Iran, Russia and Saudi Arabia are on US State Department's 'Countries of Particular Concern' (CPC) list this year.
Officers will check that taxi meters are running for unbooked fares, that drivers and vehicles are properly accredited, and that cars are registered and roadworthy.
