undocumented

a person who has come to live permanently in a country without legal permission

trabajador indocumentado

a person who is employed in a country without the legal right to work there

una persona que está empleada en un país sin el derecho legal para trabajar allí

a person who moves to a foreign country, often for work, without official authorization

a term, often with legal or negative connotations, for a foreigner who has entered a country without authorization

the process of people moving into a country to live without the required legal documents