On Thursday, Georgia was the staging ground for the largest single site immigration raid in the history of Immigration and Customs Enforcement’s Homeland Security Investigations wing.

In total, the operation at the Hyundai Metaplant campus near Savannah netted 475 arrests of immigrants working in the U.S. without authorization, the majority of whom were Korean nationals, authorities said.

Included among the people arrested on Thursday were immigrants who crossed the border illegally or overstayed visas — two groups who represent the pillars of the country’s population of unauthorized immigrants.

But Steven Schrank, special agent in charge of HSI Atlanta, said on Friday that a third group of people were swept up in this week’s raid: Workers who had entered the country through the Visa W

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