Seven people have been arrested as part of a crackdown on suspected people trafficking and benefit fraud.
Leicestershire and Northamptonshire police, the National Crime Agency and the Department of Work and Pensions staged the joint operation in Leicester and Northampton yesterday morning.
Six men and one woman are in police custody being questioned by Department of Work and Pensions and National Crime Agency officials.
Detective Chief Inspector Mark Newcombe, of Leicestershire police, said: "We worked with colleagues from other agencies who have been involved on a long and complex investigation, which has led to the execution of seven warrants.
"This operation went extremely well and reflects the collective commitment of the wider law enforcement community to tackle this type of criminality and to work to protect the vulnerable and bring offenders to justice."
Andrew Ralph, of the Department of Work and Pensions, said: "This operation clearly shows that criminals need to know we are sharing intelligence with our partners and we are ready to strike together to stop their activities."
Search warrants were executed at properties in Gilbert Close, Shearer Road and Strathmore Avenue, Rushey Mead; Cossington Street, Belgrave; Bartholomew Street, Highfields and Gwendolen Road, Crown Hills.
Two search warrants were also executed in Northamptonshire.
