The NDP is very-much a pro- worker party. When the liberals forced the workers into arbitration instead of allowing them to strike, they cut at one of the core issues for the NDP. The liberals committed their act against the railworkers in public, so the response being in public makes sense.
It would be the same as an environmental party publicly cutting ties with a “pro business” party for allowing the creation of new farm land by reducing the size of a national park.
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