U.S. Customs and Border Protection on Friday banned a Chinese fishing company from selling seafood products in the United States over concerns that the firm was treating migrant workers like slaves. The agency said it will immediately start seizing tuna, swordfish, and other seafood products from Dalian Ocean Fishing Co., Ltd., at all U.S. ports of entry, citing U.S. federal law, which prohibits shipments linked to slave or child labor. The ban also extends to products that contain seafood, such as canned tuna and pet food, according to a CBP official. While the CBP had targeted individual vessels in the past, it was the first time it had taken the action against an entire fleet of fishing vessels—numbering 32 in total—the agency said in a news briefing. “Companies that exploit their workers have no place doing business in the United States,” said Department of Homeland Security Secretary Alejandro Mayorkas in …