A SENIOR adviser to Jeremy Corbyn was reinstated as a Labour member yesterday after being suspended over claims he supported a rival party on social media.

Andrew Fisher was suspended earlier this month after apparently advocating a vote for the Class War candidate in the Croydon South seat.

In the run-up to May’s general election, he wrote: “If you live in Croydon South, vote with dignity, vote @campaignbeard,” Twitter handle of Class War’s Jon Bigger.

Labour candidate Emily Benn complained that the comment breached Labour’s code of conduct.

The party’s national executive handed him a warning following an investigation.

A Labour spokeswoman confirmed yesterday that the economist and former PCS union official has been reinstated to the party with immediate effect.

In a statement, Mr Fisher said he was “very pleased with the decision.”

He wrote: “I’ve been a Labour Party member for 20 years and all I’ve ever wanted is for Labour to be strong and effective, whether in government or opposition.

“I will continue to support Jeremy, who was elected in a landslide victory just two months ago, and help Labour build towards 2020.”

Labour MPs Caroline Flint and Siobhain McDonagh, who also made a complaint, were furious about the “slap on the wrist” given to Mr Fisher.

They claimed: “The chair of this investigation has been subjected to huge pressure, and this has compromised the independence and integrity of Labour’s disciplinary process.”

There has been no investigation into the conduct of Ms Benn, who wrote more recently that people should “consider joining the Women’s Equality Party.”