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PMA neither loaded nor unloaded ships over the weekend, leaving yard and gate operations up to individual terminals.
Port congestion is causing layoffs and inability to reach overseas consumers.
Justice Department said sentence is first against an executive in its roll-on/roll-off shipping investigation.
Transpacific carriers cite port congestion and stronger demand as economy improves.
New style port directors are trying to tailor ports to industry supply chain needs.
Senate moves to decouple fight over immigration policy from Homeland Security, but resistance remains in House.