"Enough is enough," Jewish groups have said in a letter accusing Jeremy Corbyn of failing to tackle anti-Semitism.
The Labour leader has said he is "sincerely sorry" for the pain caused by "pockets of anti-Semitism" in the Labour Party.
Mr Corbyn said he would be meeting representatives of the Jewish community to "rebuild" confidence in his party.
However, the organisations behind the open letter are planning a protest outside Parliament later.
The letter - drawn up by the Board of Deputies of British Jews and the Jewish Leadership Council - said there has been a "repeated institutional failure" to properly address anti-Semitism.
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