Deporting terrified migrants, who have broken the law working illegally on farms or in factories, is no way to stop human trafficking, according to the Salvation Army.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Listen Duration: 6 minutes 1 second 6 m Heather Moore Salvation Army advocacy coordinator on the campaign to end human trafficking ( Sarina Locke ) Download 2.8 MB

The religious and welfare organisation has said Australia's crackdown on illegal workers could be undermining the Federal Government's bid to end the trafficking.

Heather Moore is Advocacy Coordinator with the Freedom Partnership to end modern slavery with the Salvation Army.

The Freedom Partnership is partnered with the Australian Catholic Religious Against Traffic in Humans (ACRATH).

A Salvation Army submission to the Senate Inquiry into Australia's temporary work visa programs says their current state is "far from adequate".

It suggests that workers who are caught should be given bridging visas, and interviewed, so they can help catch the real criminals.

"We believe that in order to effectively address trafficking and all forms of modern slavery in Australia you have to have a protective framework in place for migrant workers," Ms Moore said.

In May 2014, illegal workers were caught, detained, and deported after a raid on a market garden at Carabooda, north of Perth.

"Anywhere from 120 to 200 workers were deported within about 24 to 48 hours," Ms Moore said.

"There were a lot of indicators of slavery and trafficking.

"I think some of the authorities would say there was no evidence of that, but it's difficult to confirm if people are deported so quickly.

"Often workers are brainwashed by their employers into believing all sorts of things. Often they come from places where you can't trust law enforcement."

Ms Moore said illegal migrant workers felt trapped and scared for their families back home.

She said bridging visas would help prevent crime, and help them get some civil justice in backpay.

In June this year, a raid on a farm at Shepparton, Victoria, saw illegal workers also deported, with reports stating they were victims of a labour trafficking ring.

Still from Four Corners program on labour exploitations on farms supplying Australia's biggest supermarkets. ( ABC )

"We just need to slow things down a bit, exercise due process and take the time to address the fears many workers face in reporting unlawful conduct against them," Ms Moore said.

She said bridging visas should not be offered open slather, but workers should be allowed to sue for back wages.

The Senate Inquiry investigating exploitation of illegal workers, or temporary protection visa workers, is due to report on August 19.