From Reuters:

Tractor-trailer drivers who haul freight from the ports of Los Angeles and Long Beach went on strike on Monday against four trucking companies, a Teamster union official said, in a move that could revive labor tension at the nation’s busiest cargo hub.

Delegations of drivers notified the companies of their intent to strike at 6 a.m. Pacific time, with picket lines going up immediately at the companies’ truck yards, Teamsters spokeswoman Barb Maynard told reporters on a conference call.

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