Federal authorities say 475 people were detained this week in what Homeland Security Investigations called the largest single-site enforcement operation in its history.The raid took place Thursday at the HLGA battery plant site in southeast Georgia, a joint venture between Hyundai Motor Group and LG Energy Solution, as part of a months-long probe into alleged unlawful employment practices and other federal crimes. U.S. Attorney Meg Heap and Homeland Security Investigations Special Agent in Charge Steve Schrank said the operation followed a judicial search warrant and focused on employers suspected of exploiting undocumented workers. Officials stressed the effort was not a...