<a href="http://www.foreignpolicy.com/story/cms.php?story_id=4173" rel="nofollow">http://www.foreignpolicy.com/story/cms.php?story_id=4173</a><p>Is this it? Behind a paywall now, but you can probably get it somehow. I searched for human slavery across comments on searchyc.
Maybe this one, found by a site-restricted Google search:<p><a href="http://news.ycombinator.com/item?id=550719" rel="nofollow">http://news.ycombinator.com/item?id=550719</a>