Senior Labour figures have been accused of obstructing investigations into anti-Semitism claims, according to BBC Panorama.
In a programme airing tonight, communications chief and Jeremy Corbn ally Seumas Milne and National Constitution Committee general secretary Jennie Formby are singled out for criticism.
Labour has denied the claims and has written a complaint to the BBC.
A total of eight former Labour officials spoke to Panorama, including four who say they have signed non-disclosure agreements (NDAs) on the subject of anti-Semitism.
Dan Hogan, who was an investigator in the disputes team, alleged people brought in by Ms Formby since her appointment overruled his group.
He said they downgraded what shouldve been a suspension to just an investigation or worse to just a reminder of conduct, effectively a slap on the wrist.
Former head of disputes Sam Matthews said he interpreted an email from Mr Milne as not a helpful suggestion but as an instruction.
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The BBC reports that, in the email from March last year, Mr Milne said there should be a review of the disciplinary process into anti-Semitic complaints.
He is said to have written: Somethings going wrong and were muddling up political disputes with racism.
I think going forward we need to review where and how were drawing the line.
The BBC suggests anti-Semitism complaints within the party have increased significantly since Mr Corbyn became leader in 2015, but is yet to release any numbers.
Testimony from whistleblowers includes allegations there were substantial disagreements within the party about what constituted anti-Semitism.
By 2016 Kat Buckingham, the former chief investigator in the disputes team, says the problem of anti-Semitism complaints was massive and real.
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She says it wasnt constructed by embittered old Blairites as we were frequently described as.
Ms Buckingham told BBC Panorama she had a breakdown and decided to leave the Labour Party.
She said: I was stuck between an angry and obstructive Leaders Office and an arcane disciplinary system.
I couldnt hold the tide and I felt so powerless and I felt guilty and I felt like I failed…and yeah I had a breakdown.
Louise Withers Green,a former disputes officer, left the Labour Party after being signed off with depression and anxiety.
In return for not having to work her notice period she signed an NDA, but she still decided to speak to the BBC.
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Louise said: “[The NDA] was really tight. When I first read it, I wondered how on earth, Id be able to apply for jobs because it was so prescriptive in not speaking about anything that I had heard of or happening in the Labour Party.”