Luis C d'Baca from the US State Department Office to Monitor and Combat Trafficking in Persons; Kevin Bales, president of Free the Slaves; David Batstone, president of Not for Sale; and Joy Ezeilo, UN Special Rapporteur for Trafficking in Persons.

Over the past 20 years China has become the world's biggest exporter of consumer goods. But behind this apparent success story is a dark secret - millions of men and women locked up in prisons and forced into intensive manual labour.

Poverty-stricken men from the north of Brazil are often lured to remote camps where they are used as slave labour.