Inside Momentum's campaign 'hackathon'
7 August 2017 Last updated at 13:58 BST
Momentum activists say they are building new online tools to reach more voters and put Jeremy Corbyn in Downing Street. But will it work?
7 August 2017 Last updated at 13:58 BST
Momentum activists say they are building new online tools to reach more voters and put Jeremy Corbyn in Downing Street. But will it work?