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Last week’s immigration operation at a battery plant highlighted a tactic that companies use to bring in foreign workers to establish new operations.

By Lydia DePillis and Hamed Aleaziz

Lydia DePillis is an economics correspondent who has reported on immigration issues. Hamed Aleaziz covers the Department of Homeland Security and immigration policy.

Almost 500 people were detained during a raid of a Georgia battery plant owned by two South Korean manufacturers last week, the largest immigration enforcement operation at one location in the history of the Department of Homeland Security.