Is Momentum a return to the bad old days of Labour's militant tendency?

First paragraph: Among Labour MPs there is a growing wave of concern about the activities of Momentum, a recently established organisation of Corbyn supporters. Former frontbencher Caroline Flint warned that it was being used by “far-left parties” seeking to penetrate the Labour party, adding: “That is exactly what far-left groups like Militant did in the 1980s. They act as a separate party operating within the Labour Party but with no real loyalty to the party.