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Port of New York and New Jersey terminals have seen additional containers from "extra loaders."
Carriers should not be allowed to profit from congestion for which they are at least partially responsible, says agriculture group.
Indictment alleges the former shipping line employee authorized payment of phony invoices.
A strike could come as soon as Monday, according to a statement from Teamster affiliate Justice for Port Truck Drivers.
The 10-ship loop will call in South China, Vietnam, Colombo, New York, Savannah and Norfolk, and is designed to provide fast transit from Asia to New York.