A shortage of West Coast port workers has forced the busiest U.S. ocean trade gateway to shut on Friday, after months of strained labor negotiations between the dock workers union and their employers. Workers at the ports of Los Angeles and Long Beach on Thursday began withholding labor, which was needed to load and unload cargo, as part of a coordinated action by the International Longshore and Warehouse Union (ILWU), according to the Pacific Maritime Association (PMA), which represents employers.
