Production resumed Wednesday at a manufacturing plant in Fullerton after an immigration raid that resulted in the arrests of 43 workers and the temporary shutdown of the facility. Employers at Terra Universal Inc., which produces equipment for semiconductor and pharmaceutical manufacturers, spent the day reassuring customers, checking employees' documents and questioning why they were targeted, according to the company's attorney. Chief Operating Officer Ken Harms said the raid took him by surprise and disrupted the entire plant. "It was completely unexpected," he said. Immigration agents executed a search warrant at 8:30 a.m. Tuesday as part of an ongoing criminal investigation,...