South Koreans suspected of working in the United States illegally were the majority of the 475 people arrested in a raid on a Hyundai-LG battery plant being built in the southern state of Georgia, a US official said Friday.The raid came as President Donald Trump cracks down on migrants across the country, vowing to carry out the largest deportation drive in US history.Thursday's operation stemmed from a "criminal investigation into allegations of unlawful employment practices and serious federal crimes," Steven Schrank, a Homeland Security Investigations special agent in Atlanta, said."This, in fact, was the largest single site enforcement operation in the history of Homeland Security Investigations," Schrank said at a press conference.South Korea has expressed "concern and regret" over the...