Green card/implication of foreign labor does add an extra bit of information beyond just inexperience - it's that they are likely to be less acquainted with the

Green card/implication of foreign labor does add an extra bit of information beyond just inexperience - it's that they are likely to be less acquainted with the laws/regulations which means they can be convinced to do illegal things and are less likely to know their rights and stand up to bad/illegal treatment by their employer.