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A leaked internal dossier detailing 45 allegations of anti-Semitism against Labour party members will be examined by Scotland Yard, Commissioner Cressida Dick said today.

The Met chief pledged to pass on the files — said to include vile messages such as “We shall rid the Jews who are cancer on us all” — to detectives to investigate whether they constitute possible hate crimes.

Among other messages in the leaked file is a serving councillor who is alleged to have used the term “Jew boy” on a child, and one member saying “Zionist extremist MPs” were “about to get a good kicking”.

It is believed the cases against unnamed party members and councillors are being handled by Labour’s internal disciplinary committee.

Ms Dick told radio station LBC: “We will scope it, we will see whether a crime has taken place. I, of course, will pass this to my experts to look at.”

The pledge came as party bosses met to discuss new measures to tackle the crisis , which has gripped the party throughout the summer. The dossier was leaked to LBC, which had it reviewed by Mak Chishty, who was in charge of dealing with hate crime for the Metropolitan police until last year. He found at least 17 of the 45 incidences should have been reported to the police as a race-hate incident for investigation.

It came as Jeremy Corbyn faced a day of intense wrangling with his party over the adoption of the International Holocaust Remembrance Alliance definition of anti-Semitism.

Ms Dick said: “Hate crime is something we take very, very seriously.”

Simon Johnson, of the Jewish Leadership Council, said: “If so many of these cases are serious enough to be referred to the police and yet Labour is dragging their heels in dealing with them, then that clearly contributes to the complete lack of confidence that the Jewish community has.

“If Jeremy Corbyn was a competent leader of the Labour Party, he would have already dealt with these cases of anti-Semitism months ago. He would have rid this party of the stain that now affects them.”

Mr Corbyn’s reluctance to adopt the IHRA definition of anti-Semitism in full, and instead develop their own working-definition of anti-Semitic behaviour, led to a summer of bitter party infighting.

Today he was set to ask the National Executive Committee, which is meeting at the party’s Victoria Street headquarters, to adopt the IHRA defintion of anti-Semitism - and add a free speech caveat to protect those who criticise the Israeli state.

However Jewish leaders and Labour MPs have said they will not back his compromise, describing it as “pouring fuel on the fire” and a “nit-picking”.

Demonstrators also descended on the party’s headquarters in Central London today as party’s disciplinary panel began a series of hearings into members accused of anti-Semitic conduct.

A dozen pro-Israel supporters lead Chants of “Oh, Corbyn’s a racist” and “Labour fascists off our streets” as Corbyn supporters gave speeches against an “Israeli apartheid”.

A Jewish Corbyn supporter Salma James, 88, said: “I am convinced that the anti-semitism charges are bogus.”

Stephen Kinnock MP told the Radio 4 Today programme warned that the free speech addition Mr Corbyn is insisting on will lead to problems.

He said: “I personally do not think this is the time to put in conditions and qualifications.”

“It’s pouring more fuel on the fire. I think the fire is still burning.”

Jim Fitzpatrick MP said the freedom of speech addition - which is what the Home Affairs Select Committee use - was not needed and unless it is dropped by the leadership several Labour MPs will continue to seriously weigh up their “future with the party”.

“I don’t see why we need a caveat. Criticism of Israel has clearly been articulated by other organisations who accepted the definition as it stands. I have no idea why Jeremy is so fixated on wanting to qualify the definition,” he said.

A Labour source said that the issue would be resolved at the meeting today and no-one wanted the row over how Labour handles anti-Semitism within the party to drag on into party conference in Liverpool which starts on September 23.

“The most likely outcome is adopting the IHRA and all of its examples and having a freedom of speech protection clarification along the lines of what the Home Affairs Select Committee adopted,” the source said.

Tomorrow MPs are due to vote on adopting the IHRA definition without any amendments at a meeting of the Parliamentary Labour Party.

Mr Fitzpatrick said he expects at least 110 MPs to go against the leadership in that vote unless he drops his freedom of speech addition.