It follows allegations that an American oil and gas drilling company operating off the West Australian coast is using a special roster system to help its fly-in, fly-out employees reduce their tax obligations in Australia.
Visa 457 and union

Oil rig "Ocean General" at an offshore oil and gas platform in the Timor Sea. Source: News Limited
The Maritime Union of Australia is calling for a royal commission into the 4-5-7 skilled migrant visa program for temporary overseas workers.
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