Who is permitted to work within the U.S.?

obviously U.S. citizens are permitted to work, but what about:
- Legal immigrants
- Illegal immigrant
Answers:   
Legal immigrants (Green Card Holders) are permitted to work in the U.S. So are the people who are contained by the US with a temporary work permit/visa. there are special circumstances that work prmit van be issued for significantly skilled workers whos service is detrimental to that special circumstance. It is illegal to hire anyone else outside of these categories. Obviously, illegal immigrant can not work in the US and anyone hiring them is subject to fines.
Immigrants who have adjusted their status or are adjusting their status. It mechanism they are given legal residency and therefore are given the right to work thus, Social Security gives them a social guarantee number and an employment authorization is issued by the USCIS until such time that they become citizens of the country.
Legal immigrants with employment visa or permanent residents, are the singular one who can work here, besides US citizens.


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