Local Labour member Luisa Attfield tweeted: "As a Jewish lesbian I am offended and as person with a brain its a baseless comparison."
On Twitter, JVL tried to calm the row, saying Ms Manson had "compared the chilling effects on free speech of thought of S28 and the IHRA".
But local Cllr Arjun Mittra responded: "This is a lie. I was in the room. She compared IHRA to section 28. You are back-pedalling because you know the mask has slipped."
On Twitter, Ms Attfield was called a "lying lesbian" and Cllr Mittra was called an "uncle Tom" by Tony Greenstein, a former Labour member who has used antisemitic slurs such as "Zio" and was expelled from the party earlier this year, but who spoke at JVL's event at Labour conference in Liverpool last month.
Mr Greenstein is also among those to have contributed towards a crowdfunding campaign supporting Ms Manson's bid to be an MP.
A gofundme.com page launched to 'Make Jenny Manson A Labour MP' includes a donation from Mr Greenstein and one from Fred Leplat - who was expelled from the Labour Party earlier this year over membership of a separate far-left organisation.
The JC has learned that several previous supporters of Ms Manson in the Finchley and Golders Green Labour Party have decided to back another pro-Corbyn candidate over fears that the JVL activist's reputation is now "too toxic."
One local member told the JC: "Jenny Manson's record of past mistakes is as long as my arm. Her opponents would have a field day if we picked her as Labour's candidate. There's far better options available than her."
When asked about her written warning, Ms Manson said: "There are no disciplinary procedures against me. It is a breach of data protection to leak information about any confidential correspondence between the party and its members."
