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Jeremy Corbyn has handed a job in his parliamentary office to a Left-winger who admitted in court that she registered scores of fake voters.

Marsha-Jane Thompson has a criminal conviction for fraud after submitting 100 voter registration forms that she filled in herself, complete with forged signatures. Now the Momentum campaigner has a parliamentary security pass and a chair in the Leader of the Opposition suite at the House of Commons.

According to the latest Register of Members’ Secretaries and Research Assistants, Thompson has the title campaign manager for the Labour Party.

At Snaresbrook crown court in 2006, Ms Thompson pleaded guilty to 19 specimen counts of using a false instrument, contrary to the 1981 Fraud and Counterfeiting Act, and one count of false accounting under the 1968 Theft Act. The court heard that she submitted the forms in Newham, where she was a housing officer at the time.

Marianne Wood, Newham council’s chief internal auditor, told the court: “We managed to stop what could have been an extremely serious situation involving potentially false information getting on to the electoral register. We take fraud extremely seriously and will not hesitate to prosecute anyone who defrauds the council.”

Ms Thompson was convicted under the name Marsha Thompson and sentenced to 100 hours’ community service.

The Unison activist is a former supporter of Lutfur Rahman, the ex-mayor of Tower Hamlets who was removed from office after the election court found he used corrupt and illegal practices when seeking a second term in 2014. In 2010 she organised protests when Labour’s National Executive Committee dropped him as the party’s candidate for mayor.

As Momentum’s head of campaigning and social media Ms Thompson played a key role in Mr Corbyn’s leadership election, and her skills helped boost Labour’s youth vote in the general election. A spokesman for Mr Corbyn said: “We do not comment on staff issues.”

Party sources said she works in Mr Corbyn’s events and campaigns team. Last year, a Momentum spokesman said of Ms Thompson: “Over a decade ago, she pleaded guilty to an offence and completed community service. Marsha-Jane’s conviction is now spent. She has always been open about the conviction, which she still deeply regrets, with her employers.”