This is shocking... how? The arab empire was built on the slave trade. The whole of Dubai exists solely due to external workers, from engineers to the bricklayers.
The only shocking thing is how we in the US put up with this behavior from governments we send billions in aid to every year. You'd think we'd have the balls to suspend some their aid and have them put an end to this type of abuse.
How is that the US' responsibility? It has nothing to do with balls at all, either.
If you think the US has any interest in exerting its economic or military power in the interest of morals and ethics then I've got a bridge to sell you.
The whole of Dubai exists solely due to external workers, from engineers to the bricklayers.
External workers are fine since workers are different from slaves or "slaves". If they paid me $150K a year, I'd go there and lay bricks myself and for $1000 a month they'd get probably a billion applications. What they did is they screwed the poor Indians, Bangladeshis, Filipinos etc, once they got there.
This should not shock anyone.