"By his action over the years as well as by failing even now to take on board the full concerns of the Jewish community, we remain convinced that Jeremy Corbyn is an anti-Semite and under his leadership the once anti-racist Labour Party has become institutionally anti-Semitic and an existential threat to British Jewry".
However, he categorically refuted accusations that if the party was to be elected to government, that it posed an "existential threat" to Jewish life in Britain.
"People holding those views have no place in the Labour Party".
Last week, Dame Margaret Hodge, who is now in a dispute with the Labour Party after calling Corbyn a "racist and anti-Semite", received anti-Jewish abuse online including being called a "Zionist bitch" and "a zionist remedial cancer" in the pay of Israel.
He said this had "sometimes been used by those wanting to restrict criticism of Israel that is not anti-Semitic". Corbyn spoke in response to the recent campaign by the three leading British Jewish newspaper that published joint editorials with a headline reading "United we stand".
Writing in The Guardian, Mr Corbyn said: "I".
MP Chris Williamson - a strong supporter of Labour leader Jeremy Corbyn - said in an April interview that he saw evidence of people "setting themselves up as pro-Labour, pro-Jeremy Corbyn individuals on social media", and then making "antisemitic, frightful and abusive remarks".
But his attempts to reassure the Jewish community has failed to impress his critics.
"But I feel confident that this outstanding issue can be resolved through dialogue with community organisations, including the Jewish Labour Movement, during this month's consultation".
The timing didn't help either as it was released just before the Jewish Sabbath, leading some to suggest that was meant to avoid reaction from the Jewish community.More news: Dean wins Tennessee Dem primary for governor
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"Today, other than another article bemoaning a situation of the Party's own making, nothing has changed".
A spokesman said: "There is no trust left".
A subsequent internal Labour report on the matter - released by The Jewish Chronicle after being suppressed by Labour's National Executive Committee - found that "there have been some incidents of anti-Semitic behaviour", and recommended "disciplinary procedures".
"The onus is now on Labour to take the lead against these reactionary forces by calling them out and placing a transformative programme before the electorate - that offers hope to people on job creation, tackling low pay, providing affordable housing and driving up living standards".
"People who dish out antisemitic poison need to understand: you do not do it in my name", Corbyn wrote.
Hodge, a veteran Jewish MP said that the investigation was "punishing" her for "fair criticism", which her lawyers claim is a breach of "natural justice".
However, Corbyn promised to take "whatever measures are necessary", and said he would guarantee the security of Jewish communities, schools, places of worship, social care, culture and "Jewish life as a whole in the country".
Mr Corbyn had been hoping to make a speech addressing the anti-Semitism row at the Jewish Museum, in London, but the museum has now said there are "no plans" for a Labour event there.