Помогите перевести словосочетание employment sweep.
Контекст:
Last month, half the packing plant's 180 employees were laid off. In what turned out to be one of the biggest employment sweeps ever by the Immigration and Naturalization Service, agents sifted through the records of 5,000 workers in 13 local packing plants here...

11. An inexperienced crew is working late shift, packing apples at the Northwestern fruit produce plant here. The new hires barely keep pace with roaring conveyor belts. But things are hard here. Last month, half the packing plant's 180 employees were laid off. In what turned out to be one of the biggest employment sweeps ever by the Immigration and Naturali­zation Service, agents sifted through the records of 5,000 workers in 13 local packing plants here — and forced the companies to sack 562 de­termined to be illegal immigrants.

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