In 2015, Andrew Fisher tweeted "If you live in Croydon South, vote with dignity, vote campaignbeard", who was a Class War candidate opposing Labour. This wasn't even after the event as Campbell's was, this was in the run up to an election.
Andrew Fisher is Jeremy Corbyn's head of policy.
It's a bold move by an ailing party leadership to decide now is the time to turn against an erudite individual with a list of media contacts as long as your arm...