As referenced to in the article and highly relevant, the Kafala System [1] which has roots in Islamic adoption jurisprudence [2]. [1] http://en.wikipedia.org/wiki/Kafala_system [2] http://en.wikipedia.org/wiki/Islamic_adoptional_jurisprudenc...
>"Under the state-run kafala sponsorship system, workers are also unable to change jobs or leave the country without their sponsor company's permission." (Guardian)
> About 1.2 million foreign workers in Qatar, mostly from India, Pakistan, Bangladesh, Nepal, Indonesia and the Philippines, make up 94 percent of the labor force. There are nearly five foreign workers for each Qatari citizen, mostly housemaids and low-skilled workers. (Link 1 above)