How do i report an illegal mexican who is using a stolen social security card so he can work?

And along with that, he has filed taxes claiming dead parents and family members that do not even live in this country. how is this possible?
Update: And along with that, he has filed taxes claiming dead parents and family members that do not even live in this country. how is this possible?

Do i call it in or do i have to write a letter to report him??? Please be specific as possible.
Update 2: His father is deceased and his mother receives two retirement checks (hers and her dead husbands)....he takes care of himself and only cares about himself.
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