don't forget nations where governments or organizations oppress individuals into performing work [1][2][3]

[1] http://motherboard.vice.com/read/radio-silence

[2] https://www.foreignaffairs.com/articles/north-korea/2015-05-...

[3] http://blogs.wsj.com/middleeast/2014/10/23/u-a-e-migrant-dom...