Check out their fact sheet. Lest anyone think that modern, western industrial societies are without any slavery, this is what they have to say about the United States...

UNITED STATES: The CIA estimates that 50,000 people are trafficked as sex slaves, domestics, garment, and agricultural slaves

http://www.iabolish.com/today/factsheet.htm

It's a real and growing problem in every part of the world. I am a bit skeptical about motives of the site linked to in the opening post in this thread, however. Their activism seems mostly to be directed toward slavery in Sudan, ignoring all of the other areas where activism is needed.

This site is concerned with slavery everywhere it exists, and they are doing activist work all over the world...

http://www.antislavery.org/sitemap/sitemap.htm