U.S. Immigration and Customs Enforcement said three Colorado businesses are facing $8 million in fines due to “illegal alien employment violations.”

U.S. Immigration and Customs Enforcement said on Wednesday it planned to fine three Colorado companies a total of $8 million following worksite audits, accusing them of employing unauthorized workers.

Three janitorial companies were hit with more than $8 million in proposed fines from federal immigration authorities for employing at least 143 unauthorized workers.