Momentum is set to grab three new positions on Labour’s governing body next month, increasing the organisation’s influence over the party.
A slate that includes Jon Lansman, founder of the network of Jeremy Corbyn supporters, is expected to triumph in a ballot for local party representatives on Labour’s national executive committee.
Mr Lansman, 60, was instrumental in pushing for the creation of the three seats to add to the 40- member committee, reflecting how much leverage its leading figures have amassed.
The results of the ballot, which closes on January 12, will come after a transformative year for Momentum, which began life as Mr Corbyn’s leadership campaign in 2015. Its membership has grown to 31,000 and its supporter base has risen to 200,000. It is gaining 1,000 new members a month, insiders say.