The gang held hundreds of Polish victims captive in Britian, set them to work, stole their wages, made them eat from skips, wash in canals and threatened to kill them if they tried to escape.
Featuring exclusive access to the police and legal team who have spent more than four years bringing the gang members to justice.
The programme hears unique first-hand testimonies from slaves who have waived their lifelong right to anonymity so they can tell their stories.