The former head of Oxford Labour Club who quit after making allegations of anti-Semitism has won backing from more than 30 former leaders at the society.

Alex Chalmers stepped down as co-chair of the club this week and claimed many members, as well as Oxford students, “have some kind of problem with Jews”.

Now 32 former chairs or committee members have written an open letter for LabourList in support of Chalmers in which they describe their “horror” at reports of repeated use of anti-Semitic terms within the club.

Noni Csogor, the remaining co-chair of Oxford Labour Club, said the organisation “has always been against racism and oppression in all its forms”.

The row was sparked by the club’s decision to endorse Israel Apartheid Week, a series of rallies against the Israeli government’s approach to Palestine.

Chalmers quit the club in protest at the endorsement and now his stance has been supported by the former chairs, who claim the week “emboldens extremists”, and urge the club to reconsider.

They wrote: [IAW] “serves as a vehicle for promoting the academic, cultural and economic isolation of the Jewish state”.

The organisers of the week have strongly denied the allegations and describe themselves as an “anti-racist” organisation.

Barnaby Raine, a member of the IAW group and prominent Palestinian rights activist said: “Jewish Students for Justice in Palestine are proud of their role in organising Israel Apartheid Week for the second year in a row. IAW is motivated by the anti-racist principle that no human should have to suffer indignity of dispossession, occupation and a criminal siege simply because of their ethnic origin. We abhor all racism – we fight anti-Semitism and zionism with equal rigor.”

Csogor said Oxford Labour club would discuss their response to Chalmers’ comments and “what concrete steps we can take in future to preserve a club that’s been a safe haven for Jewish students in the past”.

Today the national Labour Students group launched an investigation, saying: “We unequivocally condemn any form of anti-Semitism. We are taking these allegations very seriously and will do whatever is necessary to ensure every Labour Club is a safe space for Jewish Students. We are proud of the long history we have of working with the Union of Jewish Students and the National Union of Students to protect Jewish students on campus and this will always be a top priority for Labour Students.”

Labour MP John Mann, chairman of the All-Party Parliamentary Group Against Antisemitism, has called for the immediate suspension of OULC:

He has tweeted: “There needs to be a full enquiry and suspension of Oxford University Labour Club for the allegations of racism”.

A Labour Party spokesperson said:

“The Labour Party condemns anti-Semitism in any form. Following recent allegations of anti-Semitic behaviour and intimidation at Oxford University Labour Club, Labour Students have launched an immediate investigation and the Labour Party welcomes and supports this action.

“If complaints are made about any individual member of the Labour Party, the party will take robust action to deal with any anti-Semitic behaviour.”

The full text of the letter is below.

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This week the members of Oxford University Labour Club (OULC) voted to endorse so-called “Israel Apartheid Week”. As former Chairs and Executive members of OULC, we oppose this decision and condemn it. We support the decision of one of the current Co-Chairs, Alex Chalmers, to resign in response.

Israel Apartheid Week purports to be a conference promoting intellectual discussion. In reality it is little more than a gathering of propagandists seeking to dismantle the only majority-Jewish member-state of the United Nations. It principally serves as a vehicle for promoting the academic, cultural and economic isolation of the Jewish state. In doing so, it strengthens the hand of those who oppose the two-state solution and emboldens extremists who seek to “resolve” the conflict by extinguishing one of the parties to it.

It is wrong to contend that Israel – a multiracial democracy – even remotely resembles the horrors of South Africa’s racist dictatorship. Israel is a nation largely composed of refugees and their descendants – from both Europe and the Arab world, living in a land to which they have deep historical and religious ties.

Worse, the appropriation of the term “apartheid” is an affront to black South Africans. The supporters of Israel Apartheid Week would do well to remember the words of Nelson Mandela: “As a movement we recognise the legitimacy of Palestinian nationalism just as we recognise the legitimacy of Zionism as a Jewish nationalism. We insist on the right of the state of Israel to exist within secure borders, but with equal vigour support the Palestinian right to national self-determination.” We share this vision and believe it is in the best traditions of OULC.

We don’t pretend for a second that there are no problems in Israel-Palestine. We have not forgotten Israel’s military occupation. We don’t ignore the imperfections of Israeli society. We don’t overlook the tragedy of conflict. But we are troubled by OULC’s decision and feel compelled to speak out.

Finally, we observe with horror what Mr Chalmers describes in his note of resignation as co-Chair from OULC.

This is not the OULC we remember and which we proudly led. OULC and the Labour Party have a long and distinguished history of fighting racism and injustice. We urge the current members to remember that tradition and to reconsider their decision.

Tom Adams – Co-Chair 2012

Ayo Ajanaku – Co-Chair 2009

Emily Benn – Executive Committee 2009

Anthony Breach – Co-Chair 2012

Alex Brodkin – Chair 2005

Mark Baker – Co-Chair 2007

David Cesar-Heymann – Co-chair 2015

Kieran Cunningham – Co-Chair 2010

Helena Dollimore – Co-Chair 2013

Jack Evans, Co-Chair 2011

Kevin Feeney – Co-Chair 2012

Jack Graves, co-chair 2005

David Green – Co-chair 2008

Lincoln Hill – Chair 2011

Sarah Hutchinson – Co-Chair 2008

Colin Jackson – Co-Chair 2011

Aled Jones – Co-Chair 2013

Oliver Kamm, Chair 1984; Leader Writer, the Times

David Klemperer – Co-Chair 2015

Stephen Longden – Chair 2005

Ben Lyons – Co-Chair 2009

Sapandeep Maini-Thompson – Executive Committee 2014

Jonathan Metzer – Co-Chair 2013

Martin McCluskey – Co-Chair 2005

Martha MacKenzie – Executive Committee 2009

Harriet Myles, Co-Chair 2007

Phillip Patterson – Co-Chair 2006

Tom Rutland – Executive Committee 2011

Kathleen Shields – Co-Chair 2011

Claire Smith, Co-Chair 2012

Alistair Strathern – Co-Chair 2010

Jamie Susskind – Co-Chair 2009

Alice Taylor – Co-Chair 2008

Jacob Turner – Co-Chair 2009