Two victims of human trafficking were found at an address in Corby during raids by police, the National Crime Agency (NCA) and the Department of Works and Pensions (DWP).
A third person taken into custody as a suspect may be reclassified as a victim who was forced to commit offences.
The raids took place yesterday (December 10) at a property in Gateford Court, on the Beanfield estate, and another in Rochester Road, on the Oakley Vale estate.
Police, who also visited five addresses in Leicester, said nothing was found at the Rochester Road address.
The operation was carried out in connection with human trafficking offences and benefit fraud.
Six men and one woman were taken into police custody to be questioned by DWP and NCA investigators and the people believed to be victims, who are of Eastern European origin, are being spoken to by specialist officers.
Det Sgt Steve Watkins, from Northamptonshire Police, said: “The search was long and extensive, but a large amount of useful evidence relating to the fraud was recovered.
“So far, the only two confirmed victims are from the Corby address, and there is one suspect who may be re-classified as a victim, forced to commit offences. The other suspects are being processed.
“It was a good opportunity to protect some people, disrupt organised crime and highlight some of the good work being done in this emerging issue to safeguard victims of human trafficking.”
The raids were carried out at 7am and police leafleted neighbours in the streets affected shortly afterwards to inform them about the operation.