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Jeremy Corbyn is facing calls to quit as patron of a pro-Palestinian lobbying group after an Evening Standard investigation found campaigners sharing a swathe of “malevolent” anti-Semitic propaganda.

The Labour leader has been closely associated for two decades with the Palestine Solidarity Campaign.

PSC says it fights racism and is the largest organisation in the UK dedicated to securing Palestinian human rights.

However, close inspection of local PSC branches across the country reveals activists are sharing anti-Semitic cartoons of Jews and conspiracy theories about Israel controlling the world.

A Standard investigation found such images as a cartoon comparing Israeli Jews with white power neo-Nazis, an ugly caricature of a Jew sowing hand grenades in a field, and an image of Israeli premier Benjamin Netanyahu bathing in Palestinian blood posing with Adolf Hitler.

All were posted in the name of local branches of the PSC, despite the organisation insisting it is “unequivocally” opposed to anti-Semitism.

Another post attacked Mr Corbyn’s deputy, Tom Watson, who has called for anti-Semitism to be rooted out of Labour, calling him an “agent” of the Israeli state. It is another blow to Mr Corbyn after months of criticism over his handling of anti-Jewish abuse.

Amanda Bowman, vice-president of the Board of Deputies of British Jews, described the posts as “anti-Jewish racism” and added: “Jeremy Corbyn must now publicly disassociate himself from this malevolent group.”

Jewish MP Ruth Smeeth said: “Equating Jews with Nazis, endorsing anti-Semitic tropes and dismissing instances of British anti-Jewish hate is vile and shouldn’t be tolerated by anyone, never mind those who purport to be on the political Left. I would urge Jeremy Corbyn to speak out and remove his patronage from the organisation until they have condemned their supporters and expelled those who are filled with hate.”

Karen Pollock of the Holocaust Educational Trust said: “The deliberate use and abuse of the murder of six million Jewish men, women and children to score political points is beyond the pale.”

One Facebook post by the Waltham Forest PSC in December last year carried a cartoon of a Jewish man sowing the “promised land” with bombs.

An Instagram account called Brixton PSC shared conspiracy memes this year including the one that smeared Mr Watson as a “corrupt Israeli agent”.

It also posted a photo of Palestinians queuing next to a border wall with the words: “21st century concentrations camp? No, just Palestinians coming home from their Israeli slave jobs.”

Leeds PSC claimed on Facebook that the Jewish Labour Movement, which passed a motion of no confidence in Mr Corbyn, was behind an “anti-Corbyn” campaign.

The same group posted a cartoon in 2017 in which neo-Nazis with swastikas are likened to Jewish men with an Israeli flag screaming “Kill all Arabs”.

Manchester PSC tweeted a graph comparing Israel and the Nazi regime, with a swastika flag.

Luton PSC has shared posts which liken Hitler to Mr Netanyahu, and a graphic meme that compared victims in Buchenwald concentration camp to an image of a West Bank checkpoint.

Nine MPs quit the Labour Party this year, many citing the leadership’s handling of anti-Semitism.

One, Ian Austin, said: “Jeremy Corbyn can’t dismiss the shocking evidence uncovered by the Standard’s investigation and no one will believe he is campaigning for peace when he only ever speaks to one side of the Israeli-Palestinian conflict.”

Many of the posts breach the International Holocaust Remembrance Alliance definition of anti-Semitism, adopted by Labour in full last year.

Mr Corbyn has spoken at PSC events, led marches and handed in petitions to No 10 on behalf of the group, whose aims include an end to the “Israeli occupation of Palestine”.

The Labour Party declined to comment. The PSC said it “takes accusations of anti-Semitism very seriously and has procedures in place to address such allegations … including the implementation of disciplinary sanctions”. It said its “values of anti-racism and anti-discrimination” are reflected in its guidance for members.