Billions in trade came to a screeching halt at U.S. East Coast and Gulf Coast ports after members of the International Longshoremen's Association (ILA) began walking off the job after 12:01 a.m. ET on October 1. The ILA is North America's largest longshoremen's union, with roughly 50,000 of its 85,000 members making good on the threat to strike at 14 major ports subject to a just-expired master contract with the United States Maritime Alliance (USMX), and picketing workers beginning to appear at ports. The union and port ownership group failed to reach agreement by midnight on a new contract in a protracted battle over wage increases and use of automation.