Seven illegal workers have been found at businesses in Devon and Cornwall following a series of raids by the UK Border Agency, the BBC reports.
The men, from Bangladesh, Turkey, China and Malaysia, were detained by a team of specialist officers last week.
Six are being held in detention and one has been released while officers consider his immigration application.
The men were found in restaurants and takeaways in Bude, Camelford, Liskeard, Holsworthy and Plymouth.
UK Border Agency spokeswoman Jane Farleigh described the raids as “notable successes” for South West officers.
“If people want to live or work in the UK, there are ways they can come here legitimately – such as applying through our points-based system for migration,” she said.
“If they choose to flout the law, we will find them and look to remove them from the country.”
The UK has an estimated 500,000 – 750,000 illegal workers, and leading think tank, ippr, says it would take 20 years and £5 billion to remove them.
The LSE (London School of Economics) said in a recent report that granting amnesty to long-term illegal immigrants in the UK, could add up to £3bn to the economy. The LSE report added that an amnesty would not lead to a rise in migration but would raise spending on welfare services and housing.