CAA's first demonstration was in 2014 against the
Tricycle Theatre in London, which had cancelled its hosting of that November's
UK Jewish Film Festival due to the
contemporaneous conflict in Gaza, unless the festival rejected funding from parties involved in the conflict, specifically a £1,400 sponsorship from the Israeli embassy, which the Tricycle Theatre offered to replace. Later that same summer, CAA led a demonstration outside the
Royal Courts of Justice, attracting an estimated 5,000 people in the largest protest against antisemitism in a generation following a spike in antisemitic incidents. Attendees heard from
Chief Rabbi Ephraim Mirvis,
Maajid Nawaz,
Douglas Murray, representatives from the Board of Deputies and others. In August 2018, CAA organised a demonstration outside
Labour Party's headquarters to protest against the handling of
antisemitism in the Labour Party, and to condemn the-then party leader,
Jeremy Corbyn. That same month, the organisation launched a
Change.org petition titled "Jeremy Corbyn is an antisemite and must go"; it featured a Labour slogan modified to read "For the many not the Jew", which was signed by over 30,000 by 30 August 2018. A counter-petition against CAA with the title "To Get the Charity Commission to Deregister the Zionist Campaign Against Anti-Semitism" was signed by almost 7,500 and sent to the
Charity Commission for England and Wales, which said in response that it was "assessing concerns raised about the Campaign Against Antisemitism's campaigning activities". In October 2018, the Charity Commission said that charities must be independent of party politics and insisted that CAA reword its petition. In November 2018, CAA asked the
Equality and Human Rights Commission (EHRC) to investigate the Labour Party. In May 2019, following complaints submitted by CAA, the EHRC launched a formal investigation into whether Labour had "unlawfully discriminated against, harassed or victimised people because they are Jewish". Following the referral to the EHRC by CAA, the
Jewish Labour Movement and Labour Against Antisemitism Ltd also made submissions in support of the referral. The investigation ultimately found that the Labour Party had committed unlawful acts of discrimination against Jews under Jeremy Corbyn.
Keir Starmer, leader of the Labour Party, responded to the findings when they were published in October 2020, saying at a press conference that it was a "day of shame" for the Labour Party. In December 2019, CAA held a demonstration outside Parliament under its subsidiary brand Together Against Antisemitism. 3,200 attendees heard from speakers such as
Tom Holland and
Robert Rinder. On 26 November 2023, following several
pro-Palestinian marches in London during the
Gaza war, the CAA organised the
March Against Antisemitism, starting at the
Royal Courts of Justice. The event was supported by mainstream Jewish organisations and figures, including the Chief Rabbi and the
Jewish Leadership Council. Estimates from police indicate that between 50,000 and 100,000 people attended the march; it was claimed by the organisation to be "the largest gathering of its kind since the
Battle of Cable Street". One month prior, CAA held a smaller demonstration outside the
Scotland Yard Headquarters, to protest against what they deemed police inaction in the face of an uptick in antisemitic hate crimes. == Polling ==