In idyllic Sidney, Ohio, roughly two miles southwest of the 166-year-old fairgrounds, just past the Louis Sullivan-designed bank and ornate Court Square, lies the newest location of SEMCORP Manufacturing USA Inc., a Chinese battery component manufacturer that prefers its new hires speak Mandarin. Photos and other investigative materials reviewed by the Daily Caller News Foundation show Chinese nationals being transported between temporary housing in motels and the Sidney plant at unusual hours, resembling the “996” (9 a.m. to 9 p.m., 6 days a week) practice in China. The materials include job posts on Indeed.com listing the company’s preferred language as...