(Loretta Tofani/Special to the Tribune)

Zhu Qiang, 24, lost his right arm while making plastic bags for American supermarkets and clothing stores in a factory in Dongguan. Zhu's job was to place small plastic pieces into a machine that made bags. The machine's suction force grabbed Zhu's arm, tearing it off. The same accident happened to another worker with the same machine 15 days later, Zhu said.