For nearly eight years, federal agents investigated a case involving a Chinese restaurant in Mobile over suspicions that it was employing and housing illegal immigrants. Homeland Security Investigations (HSI) began looking into the matter in 2014 after receiving a tip that the now-defunct China Super Buffet was harboring the unauthorized workers. In June 2021, federal agents raided the restaurant. Restaurant owner Zheng Kong Zheng, along with his wife De Yun Wang and sister Kong Mei Zheng, admitted to harboring the illegal immigrants and pleaded guilty last month to federal charges. Local affiliate NBC News 15 reports that the defendants acknowledged…