Corbyn decided to stand as a candidate, having been disillusioned by the lack of a left-wing voice, and said to his local newspaper, The Islington Tribune, that he would have a "clear anti-austerity platform".

[19] Jonathan Dean characterised Corbynmania as a political fandom, comparable with the enthusiastic followings of popular media stars and other modern politicians such as Bernie Sanders and Justin Trudeau.

Sung in the style of a football chant to the tune of a riff from "Seven Nation Army" by The White Stripes,[32] it attracted special attention at the Glastonbury Festival 2017, where Corbyn appeared and spoke to the crowds.

[39] Corbyn stressed his desire to reduce the "theatrical" nature of the House of Commons, and his début was described in a Guardian editorial as "a good start" and a "long overdue" change to the tone of PMQs.

[57] On 11 January 2016, Shadow Attorney General Catherine McKinnell resigned, citing party infighting, family reasons and the ability to speak in Parliament beyond her legal portfolio.

[62] Following the 2016 United Kingdom European Union (EU) membership referendum, Corbyn was accused of "lukewarm" campaigning for Britain to remain and showing a "lack of leadership" on the issue by several party figures.

[63][64] Alan Johnson, who headed the Labour In for Britain campaign, said that "at times" it felt as if Corbyn's office was "working against the rest of the party and had conflicting objectives".

[68] Three days after the EU referendum, on 26 June, Hilary Benn was sacked after it was disclosed that he had been organising a mass resignation of Shadow Cabinet members to force Corbyn to stand down.

[94] More than 40 female Labour MPs, in an open letter during the campaign in July 2016, called on Corbyn to deal with issues relating to online abuse, and criticised him for his allegedly unsatisfactory responses and inaction.

[97] A dispute, nicknamed Traingate in the media, developed a week later when Virgin released CCTV images appearing to show that Corbyn had walked past some available seats on the train before recording his video.

[103] He continued: "Together, arguing for the real change this country needs, I have no doubt this party can win the next election whenever the Prime Minister decides to call it and form the next government.

"[104] In January 2017, Corbyn announced that he would impose a three-line whip to force Labour MPs to vote in favour of triggering Article 50 of the Treaty on European Union to initiate the withdrawal of the UK from the EU.

[114][115] This has partly been attributed to the popularity of its 2017 Manifesto that promised to scrap tuition fees, address public sector pay, make housing more affordable, end austerity, nationalise the railways and provide school students with free lunches.

[116][117][118] Corbyn's election campaign was run under the slogan "For the Many, Not the Few"[119] and featured rallies with a large audience and connected with a grassroots following for the party, including appearing on stage in front of a crowd of 20,000 at the Wirral Live Festival in Prenton Park.

The report stated that officials operated a "secret key seats team from where a parallel general election campaign was run to support MPs associated with the right wing of the party".

Heneghan said the use of funds in BMS was legal, as it had been authorised by the General Secretary, and stated it had been kept from Corbyn's office because staffers believed they were "in a bind" and "felt it was pointless to try and discuss this sensibly with Jeremy's staff".

[143] Polling by the end of the first week of campaigning during the 2017 general election was suggesting a defeat for Labour with the parliamentary party much reduced and a landslide victory for the Conservatives with a majority of perhaps 150 MPs.

[147] Corbyn sacked three Shadow Cabinet members and a fourth resigned[148] after they rebelled against party orders to abstain on a motion aimed at keeping the UK in the EU single market, which was put forward by Labour MP Chuka Umunna.

Murray said that at the time Corbyn and his team "just didn't think the Russian state would be so stupid and brazen as to [...] carry out a poisoning attack on British soil", although he admitted "given the Litvinenko precedent perhaps we should have done".

[164] In February 2019, seven MPs – Chuka Umunna, Luciana Berger, Chris Leslie, Angela Smith, Mike Gapes, Gavin Shuker and Ann Coffey – resigned from the Labour Party to form The Independent Group, citing Corbyn's handling of Brexit and of allegations of antisemitism.

[182] In a statement, Salah condemned antisemitism[183] and denied the accusation of blood libel, of which he was later convicted and sentenced to eight months in prison[184] before he successfully appealed his deportation.

"[185] In 2012, the artist Mear One publicised on social media that his mural Freedom for Humanity, about exploitative bankers and industrialists, was being censored; Corbyn responded at the time by questioning the removal of the artwork, and then in 2018 was criticised by Jewish leaders for not recognising an antisemitic canard.

[189] Jonathan Sacks, a former Chief Rabbi, described the remark as "the most offensive statement made by a senior British politician since Enoch Powell's 1968 'rivers of blood' speech.

[196] In July 2018, Labour, with Corbyn's support, agreed a code of conduct which excluded or amended some of the examples from the IHRA Working Definition of Antisemitism relating to criticism of Israel.

He was asked by the society's President, Joel Rosen, what he had done to stop Luciana Berger, a Jewish MP for Liverpool Wavertree, from being "hounded out" of the Labour party.

[209] In November 2019, a number of British public figures urged voters in a letter published in The Guardian to reject Corbyn in the impending general election, alleging an "association with antisemitism".

[221] A video of soldiers from the 3rd Battalion, Parachute Regiment, stationed in Afghanistan using an image of Corbyn for target practice was posted on social media in April 2019.

The Independent expressed the view that Corbyn was "unpopular in parts of the military because of his past policies on Northern Ireland, Trident and opposition to the Iraq War and other foreign interventions".

[224] In 2019, Corbyn refused an invitation to attend a state banquet for Donald Trump, hosted by Queen Elizabeth II during the president's June visit to the UK.

[231] During the campaign for the upcoming general elections, Corbyn was accused by the Hindu Council UK of promoting anti-Hindu sentiments [232] following his disparaging comments on the caste system[233] & his condemnation of the Hindu-right wing Bharatiya Janata Party led Indian government's revocation of the special status of Jammu and Kashmir.