from a wider problem in the left of Occupy/Anonymous/money cranks/Free Men on the Land/Zeitgeist/truthers a fairly substantial number in or emerging from that orbit have ended up in Labour or Corbyn supporters. As mentioned The Canary is a good example.Go on, I'm really not aware of this...
I don't think they'd amount to more than a relatively small minority but they have a loud voice on the internet and are good at circulating their ideas.
It's been an issue in anti cuts/disability stuff from my experience, and that's moved into Labour to quite an extent.