Migrant employers who exploit foreign workers could face deportation under a law change proposed by Immigration Minister Michael Woodhouse.
Mr Woodhouse told a select committee this morning that he was working with the labour and justice ministries to address the "small but growing'' problem of migrant exploitation.
The minister said that he had a particular interest in the bosses of migrant workers, many of whom were migrants themselves.
"Where [workers'] rights are being breached by employers who are themselves recent migrants, you can expect there to be some sanctions.''
Mr Woodhouse said that he could not rule out deportation for offenders.