Eight people suspected of human trafficking have been arrested in what is thought to be one of the largest operations of its kind in the UK.
Two hundred staff from nine agencies took part in Operation Ruby across Northamptonshire and Lincolnshire.
Police said 60 workers from Eastern Europe were being interviewed as victims of an operation run by a gang.
The workers were picking leeks in a field near Holbeach, Lincolnshire, when officers carried out the first raid.
A police spokeswoman said the men and woman, aged between 15 to 67, had been taken to Kettering, Northamptonshire, where they were being treated as potential witnesses and victims.
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