Seven people are being questioned by officers as part of a police probe into alleged modern slavery in factories.
Leicestershire Police said it executed warrants at several addresses in Leicester and Narborough on Tuesday.
A spokesman said they were examining “suspicions” Hungarians were forced to work unpaid in East Midlands factories.
Three men aged 33, 40 and 51, and four women aged 27, 30, 32 and 40, were arrested on suspicion of conspiracy to breach the Modern Slavery Act 2015.
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