Human trafficking and US contractors in Iraq

It was reported almost from the beginning of the occupation that US contractors were transporting in tens of thousands of foreign workers to Iraq, an idea that made no sense to me then and is just as puzzling to me today. There has always been something fundamentally wrong with the US approach that allowed contractors to fly poor workers into a poor country. With unemployment in Iraq already high, why in the hell did the US allow this practice to go on for so long and how could they not have know about these abuses?

I realize that the standards have lowered considerably under this administration but shouldn't there already be something in place to safeguard workers human rights in these situations? Secondly, can someone please explain why we are not doing more to help employment for regular Iraqis? You can't tell me that Iraqis would not want jobs and that boosting employment would not benefit the rebuilding of the country.