More from CNN’s Freedom Project: Free the Slaves President Kevin Bales, along with other modern-day slavery experts discusses the difficulty in counting the number of slaves around the world.
The challenges of counting a ‘hidden population’
By Manav Tanneeru
Slavery still exists. Of that there isn’t much dispute, if any. But how widespread is what many experts call modern-day slavery?
Estimates range from about 10 million to 30 million, according to policymakers, read more >