Immigration officers have arrested six people on suspicion of working illegally at the Rathbone Kear bakery in Wigan, Greater Manchester.
Two men later appeared before Wigan magistrates charged with using false passports to gain employment at the bakery and were served with deportation papers.
The court heard that one of the men had been at the bakery for three years, earning a total of £45,000.
Prosecutor Anne-Marie Siney said: "This is an offence being committed all over the country."
A spokesman for the Border & Immigration Agency said: "This operation is an example of the work we undertake every week throughout the UK to tackle illegal working."