Jeremy Corbyn (pictured) has been accused of failing to tackle the racism among his supporters

The anti-Semitism scandal has dogged Labour since Jeremy Corbyn was elected leader in 2015.

Here is a timeline of the controversies:

April 2016:

Labour MP Naz Shah is suspended for anti-Semitic posts - including one in which she appeared to endorse calls for Israelis to be deported to the US.

She apologised and was given a formal warning.

Ken Livingstone goes on the radio to defend Ms Shah - but sparks fresh controversy by claiming that Hitler supported Zionism.

He is suspended by Labour but refuses to apologise and has repeated the claim many times.

He eventually quits Labour two years later, saying his suspension has become a distraction.

June 2016:

A two-month inquiry by civil liberties campaigner Shami Chakrabarti finds that Labour is not overrun by anti-Semitism.

But the launch is overshadowed when Jewish Labour MP Ruth Smeeth flees it in tears after being accused by Corbyn supporter Marc Wadsworth of colluding with the press.

Critics accuse the report of being a whitewash and Ms Chakrabarti is widely criticised for accepting a peerage from Jeremy Corbyn shortly afterwards.

October 2016:

The Home Affairs Select Committee says Labour is guilty of incompetence over its handling of anti-Semitism and of creating a safe space for people with 'vile attitudes towards Jewish people'.

March 2018:

It is revealed that Jeremy Corbyn defended an artist who painted an anti-Semitic mural and said the offensive art should be removed.

He apologises saying he did not properly look at the picture before he made the post.

Jewish leaders take the unprecedented step of holding a demonstration outside Parliament protesting Mr Corbyn's failure to tackle anti-Semitism.

Several Labour MPs address the crowds.

April 2018:

Marc Wadsworth is expelled from Labour after being accused of anti-Semitism.

Meanwhile, Labour Jewish MPs tell of the anti-Semitic abuse they have suffered in a powerful parliamentary debate - and round on their leader for failing to tackle it.

July 2018:

The Labour leadership sparks fresh anger by failing to fully adopt the International Holocaust Remembrance Alliance's definition of anti-Semitism

Peter Willsman, a strong ally of Jeremy Corbyn, is secretly taped ranting that Jewish 'Trump fanatics' invented the anti-Semitism storm engulfing Labour.

In an angry diatribe at a meeting of Labour's ruling executive committee, he said he was 'amazed' there was evidence party members hated Jews.

He claimed 'some of these people in the Jewish community support Trump – they are Trump fanatics' before shouting: 'So I am not going to be lectured to by Trump fanatics making up duff information without any evidence at all.'

August 2018:

Jeremy Corbyn issues a video insisting he is committed to tackling the racism - but it is panned by Jewish leaders.

Corbynistas mount a social media campaign to get deputy Labour leader Tom Watson to quit after he criticises the party's handling of anti-Semitism.

The Daily Mail exclusively publishes photos of Jeremy Corbyn holding a wreath at a ceremony where a terrorist linked to the Munich massacre was honoured.

The Labour leader insists he was there to honour others killed - but faces fresh calls to quit over the scandal.

February 2019:

Nine MPs including Luciana Berger, Joan Ryan and Ian Austin are among those who quit the Labour Party with broadsides at inaction over anti-Semitism under Jeremy Corbyn's leadership.

Berger, the Jewish Liverpool Wavertree MP, had faced a barrage of attacks from members of her own local party as well as wider abuse, said Labour had become 'institutionally anti-Semitic'.

Enfield MP Joan Ryan was attacked because she was the chairwoman of Labour friends of Israel. And Dudley's Ian Austen, who adoptive father was Jewish, said he had become 'ashamed' of what the party had become under Mr Corbyn's leadership.

November 2019:

MP Chris Williamson, a close ally of Mr Corbyn, quits the party after being blocked from restanding in his Derby North seat at the general election. He had been suspended after saying that Labour had been 'too apologetic' about anti-Semitism.

Mr Corbyn later faced an anti-Semitism row of his own after a major intervention by the Chief Rabbi Ephraim Mirvis. He accused the left-winger of allowing the 'poison' of anti-Semitism to take root in Labour. His comments were later backed up by the Archbishop of Canterbury.

Mr Corbyn declined repeatedly to apologise to British Jews in a searing interview by the BBC's Andrew Neil and said that Mr Mirvis was 'wrong'.