[DanBC]

African slaves count as slaves under this definition.

I'm not sure why you brought that up - that's not controversial.

They include significant to cover cases of bonded labour or trafficked workers. In theory a woman traffiked from one country to another and forced to work as a prostitute is free to go the that country's police forces to report the crime but we know that they don't actually have that freedom.

See also people who are transported to another country and have heir passports taken from them.

Here's a gruesome article about bonded labour in India.

http://www.bbc.com/news/magazine-27486450