In general, a favorable labor
certification issued by the US Department of Labor is sometimes required before
the petition (requesting permission to bring a foreign worker to the United
States) can be filed with the USCIS government agency. Two key components of a
favorable labor certification basically declare that there are no qualified
American workers available and willing to fill the US job opening, and the
wages of American workers will not be harmed by bringing in a foreign worker
for that position.