South Korea’s foreign minister flew to the U.S. on Monday to secure his citizens’ return.

A lawyer for several workers detained at a Hyundai HYMTF factory in Georgia says many of the South Koreans rounded up in the immigration raid are engineers and equipment installers brought in for the highly specialized work of getting an electric battery plant online.

Atlanta immigration attorney Charles Kuck, who represents four of the detained South Korean nationals, told The Associated Press on Monday that many were doing work that is authorized under the B-1 business visitor visa program. They had planned to be in the U.S. for just a couple of weeks and “never longer than 75 days,” he said.

“The vast majority of the individuals that were detained by U.S. Immigration and Customs Enforcement

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