We've had a similar issue over here for many years on a smaller scale obviously. Unscrupulous employers who know the staff do not have work permits & they are under paying. In some cases below the award national minimum wage. And in some cases, the employers have actually been involved in obtaining the persons from overseas to work illegally over here. There are strict guidelines for employers to follow. Unless it's a job area that is known to have a shortage of skilled staff, it is difficult for employers to obtain work permits for overseas persons. Plus they must guarantee various things such as wage amount, work benefits, etc. Illegally obtaining overseas workers means many of those work awards such as holiday pay, sick leave, requirements about relieving staff, etc. go out the window. Such illegal workers have no rights, because if they speak up, they get sent home.