SEOUL — The immigration raid that snatched up hundreds of South Koreans last week sent a disconcerting message to companies in South Korea and elsewhere: America wants your investment, but don’t expect special treatment.

Images of employees being shackled and detained like criminals have outraged many South Koreans. The fallout is already being felt in delays to some big investment projects, auto industry executives and analysts said. Some predicted that it could also make some companies think twice about investing in the U.S. at all.

“Companies cannot afford to not be more cautious about investing in the U.S. in the future,” said Lee Ho-guen, an auto industry expert at Daeduk University, “In the long run, especially if things get worse, this could make car companies turn away from the U

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