Once a work record is established. he is entitled to unemployment compensation or whatever other benefits his type of work provides workers who are American citizens. As a result. the greencard worker is not counted separately and is considered available domestic labor. Since July 1. 1963. every Mexican applying for a permanent visa to work in the United States has been required to prove that he has a bona fide job offer. The Department of Labor. through its affiliated State employment security agencies. must then check to insure that a labor shortage actually exists in that job classification and that the employment of this worker will not adversely effect U.S. workers similarly employed. On the basis of its findings. the Labor Department may either approve or disapprove admission.