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Panama Canal has seen fuller vessels and unscheduled "sweeper" ships moving cargo to the East Coast.
Justice Department said sentence is first against an executive in its roll-on/roll-off shipping investigation.
The Taft-Hartley Act gives presidents ability to intervene in damaging work stoppages such as the one engulfing West Coast ports.
Sales, hiring and capital expenditures are expected to rise, according to a Business Roundtable survey.
Congressional watchdog agency told Senate lawmakers that FMCSA should enhance its Safety Measurement System for motor carriers.
Containers in stack at Centerm contained trichloroisocyanuric acid, according to the terminal operator.