UNITE leader Len McCluskey demanded an investigation yesterday into last weekend’s scandal-hit Young Labour election, which right-wing candidate Jasmin Beckett won by a single vote.

Mr McCluskey said evidence of misconduct in her election as youth representative to Labour’s national executive committee (NEC) “grows stronger by the minute.”

And he called on Labour general secretary Iain McNicol to “restore faith and trust in Young Labour” by taking action.

Ms Beckett beat left-wing candidate James Elliott by just 0.16 per cent in the ballot conducted at Young Labour’s fractious conference in Scarborough this weekend.

But the result could yet be overturned if allegations that she violated Labour’s code of conduct are upheld.

The Star has seen a complaint, sent to Mr McNicol, which shows how Ms Beckett encouraged supporters to suggest on social media that her left-wing rival was an “anti-semite.”

The complaint states: “It would be difficult to imagine a more damaging accusation, electorally or personally, than that of racism.

“Her disparagement represents a severe violation of the Candidate Code of Conduct and due to this severity, should result in her immediate disqualification from the election.”

Concerns have also been raised about the election process.Reports that at least nine delegates were prevented from voting for “hugely questionable” reasons have been passed to Mr McNicol.

A complaint is also being made over the conduct of four Labour Party staff members who allegedly broke impartiality rules by voting in the ballot.

Supporters of Ms Beckett have hit back with bullying claims.

Zac Harvey, a Unite delegate, complained that he had been “intimidated” because he was voting for Ms Beckett.

But Unite young members issued a strongly worded rebuttal yesterday saying they had maintained a “respectful manner” despite his failure to follow the union’s democratically decided policy of voting for Mr Elliott.

Mr McCluskey praised the “dignity” his young members had showed in the face of “vicious lies and an organised assault on their integrity.”

He said: “They put to shame those in our party whose conduct has been nothing short of disgraceful and confirm once again that some in our midst will stop at nothing, including destroying the reputation and hopes of our party’s young activists, in their quest to undermine the Labour leadership.”

A Labour spokeswoman said peer Jan Royall is “investigating the conduct of individual Young Labour members.”