Bob Crow, the late leader of the Rail, Maritime and Transport union, once said “It’s an old media myth that the RMT union resorts to industrial action lightly.” These days, we’d call such a claim “trolling.” Indeed, as the historian Dr Jim Moher points out, Crow “cherished” a signed shirt from Millwall player Dennis Wise that bore the message “from one striker to another.”

With the RMT poised to

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