: Los Angeles, Long Beach port closures threaten to revive supply-chain nightmare

Terminals at the ports of Los Angeles and Long Beach remained effectively closed Friday after an absence of dockworkers at both key U.S. import hubs, raising concerns of renewed tangles in the nation’s distribution network that could lead to shipping delays and bigger disruptions to the economy.

Dockworkers stopped showing up Thursday night following months of contract negotiations between the union representing the longshoreman and the terminals’ operators. The Pacific Maritime Association, the group representing terminal…