Many people become permanent residents because they obtain job or offer of employment in the United States. In some cases, highly skilled workers, professional with advanced degrees, those with extraordinary abilities in certain professions, and investors/entrepreneurs are given priority to immigrate through several immigrant categories. For most of these categories, a Labor Certification (also known as the “PERM”) from the U.S. Department of Labor must be obtained to prove that no American workers will be displaced by foreign workers. The certification must show that there are not enough U.S. workers in the geographic area where the immigrant is to be employed, who are able, willing, qualified, and available to work in that field.