Trafficking workers into the UK for forced labour is on the increase, an authority dealing with exploitation has warned.
The problem has been highlighted by some "shocking" cases where people have been forced into "modern-day slavery", said the Gangmasters Licensing Authority (GLA).
Chief executive Paul Broadbent announced a drive to help businesses in Derbyshire identify workers who may have been trafficked into the UK.
"Trafficking workers into the UK for forced labour is a problem that is on the increase.
"This was highlighted recently in Derbyshire by some shocking, high-profile cases, where people have been forced into lives of modern-day slavery," he said.
The GLA has joined forces with Derbyshire Police to visit firms in the county that might be at risk from trafficking.
The move follows the recent jailing of two Slovakian couples from Derby for human trafficking for forced labour.
The GLA, formed in 2005 in the wake of the Morecambe Bay cockle picking disaster when 23 Chinese workers drowned, said it will visit firms using large numbers of migrant workers.