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Hundreds of far Left supporters of Jeremy Corbyn will be expelled from Labour within days after its ruling body agreed to ban four groups accused of promoting a “toxic culture” within the party.

The ruling National Executive Committee (NEC) decided on Tuesday to proscribe ‘Resist’ and ‘Labour Against the Witchhunt’, factions which both claim anti-Semitism allegations have been politically motivated.

‘Labour In Exile’, which actively welcomes expelled or suspended members, was banned. Another group, ‘Socialist Appeal’, which describes itself as Marxist, was also proscribed.

HuffPost UK understands that letters of “auto-exclusion”, informing members they have effectively expelled themselves by being members of any of the groups, will be sent by the end of this week.

The NEC approved the proscription with a big majority, insiders said.

Many of the members of the four factions were strong supporters of former leader Corbyn, who remains suspended from the party whip following his reaction to an equalities watchdog finding of institutional anti-Semitism.

The NEC also agreed to set up a new panel which would look assess whether other fringe groups operating within the party should also be proscribed.

The panel will be drawn from the Organisation Sub-Committee of the NEC, but insiders said that it would not operate as a “Star Chamber” because once it ruled which groups should be banned, expulsion was automatic.

In one concession to critics, it was agreed that the full NEC would have to ratify any decisions by the “Org Sub” committee.

As the lengthy NEC meeting took place, members of the far-Left groups and others – including Corbyn’s brother Piers – demonstrated outside Labour’s HQ in London.

Grassroots group Momentum and Unite the union had both warned that the attempt to “purge” the groups was an act of “machismo” that was unnecessary.

And former shadow chancellor John McDonnell had tweeted that it was a “standard Blairite” tactic to try and show how strong a leader Starmer was.

Standard Blairite fare to try show how strong a leader you are by taking on your own party but bizarre to do it by expelling people, most of whom have left already. Looks desperate when what is needed is restoration of whip to Jeremy Corbyn, publication of Ford & taking on Tories

— John McDonnell MP (@johnmcdonnellMP) July 17, 2021

Corbyn too had expressed strong opposition to the plan.

Today’s proposals to the Labour NEC are divisive and raise the threat of further future attacks on party democracy.

Now is the time when all of our energy should be concentrated against the Tories and in campaigning for people’s health, jobs and livelihoods. https://t.co/o30OuiIDda

— Jeremy Corbyn (@jeremycorbyn) July 20, 2021

But one member of the NEC told HuffPost UK that the move was “morally important” because members of the groups had supported those who had been expelled for anti-Semitism.

‘Socialist Appeal’ has also been described as an “entryist” group and some MPs believe its expulsion had echos of the booting out of Militant under Neil Kinnock in the 1980s.

The margins of the proscription votes on the NEC underlined the strength of support Starmer now has on the ruling body, with two-to-one majorities for most of them.

The narrowest vote was to ban ‘Socialist Appeal’, by a margin of 20 votes to 12.