On October 18, Unifor, Canada’s largest private sector trade union notified the St. Lawrence Seaway Management Corporation that its members are ready to strike as of midnight on Saturday, October 21, 2023, which would effectively shut down transit through the Seaway.
Management of the Seaway is shared by the U.S. and Canada and the St. Lawrence Seaway Management Corporation is responsible for the movement of marine traffic through the Canadian Seaway facilities, which consists of 13 of the 15...
https://www.marinelog.com/legal/shipping/strike-could-close-the-st-lawrence-seaway/