https://phys.org/news/2018-10-broken-migrant-workers-wage-theft.html

Fewer than one in 10 migrant workers took action to recover unpaid wages even though most know they are being underpaid, according to the report Wage Theft in Silence.

"Our study confirms that Australia has a large, silent underclass of underpaid migrant workers," said senior law lecturer at UNSW, Bassina Farbenblum. "The scale of unclaimed wages is likely well over a billion dollars."