and I know he is a right-wing mouthpiece, but Guido Fawkes has this piece on the Corbynista Ultras and Momentum...
https://order-order.com/2017/06/16/corbynista-ultras-involved-in-storming-of-kensington-council-hq/
Reported in plenty of the newspapers...
http://www.express.co.uk/news/uk/817529/Labour-million-march-street-Jeremy-Corbyn-election-result-John-McDonnell
http://www.telegraph.co.uk/news/2017/06/15/john-mcdonnell-calls-one-million-protesters-take-streets-bid/
McDonnell calling for millions to get out on the streets and sending his Momentum attack dogs and Corbynista Ultras to rile up the crowds isn't exactly going to help, is it?