Seven arrests were made in Brechin after a joint effort from Police Scotland and Home Office Immigration officers.
Of the seven people arrested, six were male - five from Bangladesh and one from Pakistan. A woman from China was also arrested.
The Bangladeshi men, aged 24 to 32, were found when officers visited The Swan Indian restaurant, Swan Street. Four were discovered working as waiting and kitchen staff, and the fifth was having a bath in the staff accommodation when officers arrived.
One of the men is a failed asylum seeker, two are illegal entrants and two had overstayed their visas.
A 42-year-old woman from China was found at New Diamond Chinese takeaway, High Street. Checks revealed she had overstayed her visa.
A 31-year-old Pakistani man, also found to have overstayed his visa, was arrested when officers visited the Kohe Noor takeaway, St David’s Street.
Chief immigration officer Tonya Pentland from Home Office Immigration Enforcement, said: “We are determined to crack down on immigration offenders in Brechin, and will take steps to remove people found here illegally.
“Employers have a legal duty to ensure their employees have permission to work in the UK. If they do not take their responsibilities seriously they can expect immigration enforcement visits, further arrests and heavy fines.”
The Immigration Bill, which will be introduced later this year, will carry proposals to make life even tougher for unscrupulous employers by increasing the amount they will be charged if they are found to be employing illegal workers.
It will also cut through red tape and make it easier for legitimate businesses to comply with right to work checks.
Employers unsure of the steps they need to take to avoid employing illegal workers can visit www.ukba.homeoffice.gov.uk/business-sponsors/preventing-illegal-working/ or they can call the Home Office Employers Helpline on 0300 123 4699.