Rather curious news story
One could interpret it as referring to transphobia, but given that Momentum is likely to have purged any such people from the party, it strikes me that this is rather more likely to refer to tweets such as these
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It obviously makes far more sense that Labour would cover up an investigation into someone using violent language against feminists than they would protect someone accused of transphobia - the latter would have been expelled.... And as for 'violent language' - you'd be up in court on criminal charges, would you not, if it was supposed transphobia.
I think the nature of this complaint is quite clear.....