More than sixty Labour peers have taken out a full-page advert in the Guardian
In an unprecedented move, former Cabinet ministers John Reid, Peter Hain and Peter Mandelson are among who have put their name to the full-page advert, which has been placed in The Guardian.
The signatories make up around a third of all Labour peers in the House of Lords.
The advert reads: 'The Labour party welcomes everyone irrespective of race, creed, age, gender identity, or sexual orientation. (except, it seems, Jews). This is your legacy, Mr Corbyn.'
Addressing the Labour leader directly, they add:
Under your leadership, Labour is no longer a safe place for all members and supporters, whatever their ethnicity or faith.
'Thousands have resigned and thousands more feel unable to attend party meetings because of the toxic culture you have allowed to divide our movement.'
It also accuses Mr Corbyn of having 'failed to defend our party's anti-racist values' and says he has therefore 'failed the test of leadership'.
But Labour branded the advert 'false and misleading'.
A Labour spokesperson said: 'Regardless of false and misleading claims by those hostile to Jeremy Corbyn's politics, Labour is taking decisive action against anti-Semitism.'
Well, they would say that, wouldn't they?