Mr Murray was chief of staff for Unite the Union from 2011 until he moved to Labour headquarters in May 2017 to help with the general election campaign. His appointment as Mr Corbyns policy adviser in 2018 was controversial, with one Labour Party source telling The Huffington Post: Corbyns Labour has gone full Trump. Andrew Murray is the hard-lefts Steven Bannon.
Mr Bannon is the co-founder and former executive chairman of the alt-right news site Breitbart.
He was the chief executive officer of Donald Trumps 2016 presidential bid and served as White House Chief Strategist for the first seven months of his administration.
Despite being close allies, Mr Bannon was disavowed by the President in January last year for comments reported in the book Fire and Fury.
Like Mr Bannons, Mr Murrays ideas have existed on the fringes of mainstream politics for many years, but are now coming to the fore with a surge in both right- and left-wing populism.
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Mr Murray joined the Community Party of Great Britain in 1976 and became involved with trade unions since the 1980s.
During this time, he became a close friend of Mr Corbyns other top aide Seumas Milne through the Straight Left faction those within the Communist Party who opposed Eurocommunism.
Mr Murrays allies at this time were described by contemporary historian Francis Beckett as more extreme than most Stalinists I knew.
Mr Beckett added: The Stalinists were known as tankies, but Murrays lot were super-tankies.
Following the dissolution of the party in 1991, Mr Murray became leader of the Communist Liaison group, which itself dissolved in 1995, with its members joining the Communist Party of Britain.
Mr Murray served on the partys executive committee from 2000 to 2004 and again from 2008 to 2011.
He had contact with Mr Corbyn through the Stop the War Coalition, which opposed the wars in Iraq and Afghanistan.
He also helped organise the largest political demonstration in the UKs history the protest against the Iraq War in 2003.
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Mr Murary was the chair of Stop the War from 2001 to 2011, when Mr Corbyn succeeded him.
He later returned to the role when Mr Corbyn was elected Leader of the Labour Party.
When questioned on his appointment as a policy adviser, Mr Corbyn said Mr Murray is a person of enormous abilities and professionalism.
He added: To manage a very large union and a large number of staff takes special skills and Andrew has them.
Shadow Chancellor John McDonnel told Radio 4: He has left the Communist Party and joined Labour.
We are converting people to democratic socialism.
That said, Mr Murrays political beliefs do not appear to have shifted much over the years.
He told John Harris in 2015: Communism still represents, in my view, a society worth working towards albeit not by the methods of the 20th century, which failed.
Two former Labour MPs Angela Smith and Mike Gapes both cited Mr Murrays involvement with the Labour Party as factors in them leaving.
Ms Smith, who co-founded Change UK and later joined the Liberal Democrats, said: It is a disgrace that we have a former member of the Communist Party asserting such influence over the leader of one of Britains major parties, especially given that he has not moved on from those views.
Corbyn and his acolytes present a serious threat to national security and this is one of the major reasons behind by decision to leave the Labour Party.
Mr Gapes, who also joined Change UK, said: One of the issues surrounding my resignation was the people around Jeremy Corbyn including Seumas Milne and Andrew Murray and other people who came from far-left groups, who have got into senior positions of influence around the leader of the Labour Party.
However, Mr Murrays Lawyer insisted: Mr Murray is no threat to national security. He has been rigorously security vetted for his parliamentary pass by the police and security services.
The security services see him as no threat whatsoever to this country.
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Jeremy Corbyn aide was dedicated Communist Party member and hard-lefts Steve Bannon - Express