Candidate for Labour's disciplinary body said members alleging antisemitism should be suspended

According to minutes of a meeting of Momentum's Oxford branch, Mr Marks wrote a letter in support of suspended activist Jackie Walker on its behalf.

Ms Walker was first suspended from Labour in early 2016 after saying that “many prominent Jews were chief financiers of the slave trade”.

Her suspension was lifted only for her to be suspended again later that year after she said she had not found a definition of antisemitism she could work with and that Holocaust Memorial Day was not wide-ranging in including other genocides.

As previously reported by the JC, Mr Marks — who once accused the Board of Deputies of being behind “imagined” claims of antisemitism in Labour — is on the far-left slate of six suggested candidates for election onto the party’s National Constitutional Committee (NCC).

Last week, Momentum confirmed it would support Mr Marks as a candidate – despite earlier claims that founder Jon Lansman would block the endorsement of the JVL activist.