From the New York Times:

TRUNG SON, Vietnam — It seemed as if this village in northern Vietnam had struck gold when a Chinese and a Japanese company arrived to jointly build a coal-fired power plant. Thousands of jobs would start flowing in, or so the residents hoped.

Four years later, the Haiphong Thermal Power Plant is nearing completion. But only a few hundred Vietnamese ever got jobs. Most of the workers were Chinese, about 1,500 at the peak. Hundreds of them are still here, toiling by day on the dusty construction site and cloistered at night in dingy dormitories… China, famous for its export of cheap goods, is increasingly known for shipping out cheap labor. These global migrants often work in factories or on Chinese-run construction and engineering projects, though the range of jobs is astonishing: from planting flowers in the Netherlands to doing secretarial tasks in Singapore to herding cows in Mongolia — even delivering newspapers in the Middle East.

But a backlash against them has grown. Across Asia and Africa, episodes of protest and violence against Chinese workers have flared. Vietnam and India are among the nations that have moved to impose new labor rules for foreign companies and restrict the number of Chinese workers allowed to enter, straining relations with Beijing… From Angola to Uzbekistan, Iran to Indonesia, some 740,000 Chinese workers were abroad at the end of 2008, with 58 percent sent out last year alone, the Commerce Ministry said. The number going abroad this year is on track to roughly match that rate. The workers are hired in China, either directly by Chinese enterprises or by Chinese labor agencies that place the workers; there are 500 operational licensed agencies and many illegal ones.