On Monday, truck drivers from 3 different companies went to the picket lines to put pressure on negotiations for 20,000 employees contracts. These truck drivers are joining dockworkers that have been on strike over contracts as well. The dockworkers have been without contracts since July.
See "Truck Drivers from 3 Companies End Strike at L.A., Long Beach Ports", Andrew Khouri, Los Angeles Times, November 20, 2014