Labour's new leader must expel the "crank conspiratorial Jew-haters" who have "infected" the party, Jewish Labour Movement chair Mike Katz has said.

Reflecting on the disastrous election result for the party on December 12, Mr Katz set out what he argued whoever succeeds Jeremy Corbyn must do for the party to "start the long journey of rebuilding trust with the Jewish community".

"Millions of people... who needed Labour after a decade of austerity and crushing welfare cuts were denied a progressive government that gave a damn," he wrote for LabourList on Monday.

"That is because we gave them a choice for Prime Minister that they deemed inferior to a phone-pocketing clown in a bulldozer.

"And getting to the point of this inglorious shellacking cost us three of our best female Jewish MPs."

He added that the failure to deal with the party's antisemitism problem "spoke to those died-in-the-wool Labour voters’ concerns about his competence and leadership qualities".

Mr Katz, who stood for Labour in Hendon in 2017, said "hundreds" of people had joined JLM since the election.

He wrote: "We stayed and fought. Now it’s time to fight some more. For a leadership which will promise to adopt any recommendations arising from the Equalities and Human Rights Commission’s investigation.

"For a leadership that will drive out partisan factionalism from Labour’s disciplinary system. One that sacks all those senior staff which colluded in tolerating and denying antisemitism.

"One that speedily ejects all the crank conspiratorial Jew-haters that have infected the party."

In a particularly damning passage, Mr Katz accused Mr Corbyn of making a "political choice" in not confronting his allies over the problem.

"He opted to keep his allies close as part of his political project, rather than show them the door because they were racist," Mr Katz wrote.

The contest to replace Mr Corbyn is to formally begin on January 7, with a new leader announced by the end of March.