Final answer:
Companies use the INS Form I-9 to document that their employees have a legal right to work in the United States.
Step-by-step explanation:
Companies use the INS Form I-9 to document that their employees have a legal right to work in the United States. The form requires employees to provide documentation that proves their identity and work eligibility, such as a U.S. passport, permanent resident card, or employment authorization document. By completing the I-9 form, employers can ensure that they are hiring individuals who are legally authorized to work in the country.