We need slaves to build monuments'

"We need slaves," my friend says. "We need slaves to build monuments. Look who built the pyramids - they were slaves."

It is already home to the world's glitziest buildings, man-made islands and mega-malls - now Dubai plans to build the tallest tower. But behind the dizzying construction boom is an army of migrant labourers lured into a life of squalor and exploitation.

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