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Many Russians work in factories.
It was traditionally believed that forced labor was performed in communist countries.
Many people needed work.
Many people needed work.
Many people needed work.
factories & stuff factories & stuff
factory/factories
Same reason people of any nationality work in factories - because they can earn a living from it.
factories
The workers of the northern factories had to work for many hours and had little rest.
They use machines so people don't have to work as hard.
Most people in China don't, actually. We just hear more about the ones who work in factories because of outsourcing.