http://www.mua.org.au/news/mua-exposes-sham-foreign-labour-visas-on-chevrons-/
Why do these companies and their agencies try this on all the time!
Flick
They try it on because, in some parts of the world, they can get away with it. For that reason, the lesson learned is try it on in the first instance until they are pulled into line. In some countries that never happens.
I am pleased to note that in Oz that offenders are being brought to task for illegal actions. I strongly believe all companies should act legally and within the spirit of labour agreements whether they are enshrined in law or not.