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Labour Party Factions Explained: Blairites, Corbynites, Soft Left, and the Battle for Labour's Soul

Politics · September 16, 2025 · Sarah Mitchell · 11 min

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The Labour Party has been defined by factional warfare for decades, from the Militant Tendency in the 1980s to the Corbyn-Starmer civil war. Here's a guide to Labour's main factions, what they believe, and why internal divisions matter as much as elections.

The Labour Party is not one party but a coalition of factions locked in permanent struggle over ideology, strategy, and power. From the Militant Tendency purges of the 1980s to the Corbyn surge of 2015-2019 and the Starmerite restoration since 2020, Labour's internal battles have been as consequential as general elections. Understanding Labour's factions—what they believe, who leads them, and how they fight—is essential to understanding British politics, because the outcome of these battles determines whether Labour offers radical transformation or cautious managerialism. Here's a guide to Labour's factions, the history of internal conflict, and what it means for the party's future.

The Main Factions: A Spectrum from Socialist Left to Centre-Right

Labour's factions exist on a spectrum from democratic socialism on the left to social democracy and Third Way centrism on the right:

1. The Socialist Left (Hard Left / Corbynites)

Ideology: Democratic socialism, public ownership, wealth redistribution, anti-imperialism, transformative change

Key groups:

• Socialist Campaign Group (SCG): Parliamentary faction of around 35 left-wing Labour MPs, including John McDonnell, Diane Abbott, and Richard Burgon
• Momentum: Grassroots campaign organisation founded in 2015 to support Corbyn, now advocates for socialist policies and party democracy
• Labour Representation Committee (LRC): Older left-wing group founded in 2004, more explicitly socialist than Momentum

Policy priorities:

• Economic: Nationalisation of rail, mail, water, and energy; wealth taxes; £15 minimum wage; universal basic services
• Foreign policy: Anti-NATO expansion, pro-Palestinian self-determination, opposition to Western military interventions
• Social: Abolish tuition fees, scrap Universal Credit, build council housing, Green New Deal

Key figures: Jeremy Corbyn (independent MP, former leader), John McDonnell, Diane Abbott, Richard Burgon, Zarah Sultana, Apsana Begum

Strength: Around 30-40 MPs (including independents like Corbyn), significant grassroots support among younger members, strong in urban constituencies

Trajectory under Starmer: Marginalised through deselections, rule changes, and leadership hostility; many left-wing MPs have retired or been blocked from standing

2. The Soft Left (Centre-Left / Starmer's Base)

Ideology: Social democracy, regulated capitalism, redistribution within limits, pragmatic socialism, electability focus

Key groups:

• Tribune Group: Largest Labour faction, historically soft left but now includes centre-left and some centrists; around 100+ MPs
• Open Labour: Pluralist group advocating party democracy and progressive policies without hard-left economics

Policy priorities:

• Economic: Higher taxes on top earners, public investment, workers' rights, but no mass nationalisation
• Foreign policy: Pro-NATO, support for Ukraine, cautious on Israel-Palestine
• Social: Gradual reform, focus on NHS and education, climate action within fiscal constraints

Key figures: Keir Starmer, Angela Rayner, Lisa Nandy, Wes Streeting, Ed Miliband (though Miliband is more left-wing than Starmer)

Strength: Dominant in the parliamentary party and leadership, controls the party machinery, majority of MPs

Trajectory under Starmer: Ascendant; Starmer has consolidated soft-left/centre control by marginalising both the hard left and the Blairite right

3. The Centre-Right (Blairites / Progress / Third Way)

Ideology: Third Way social democracy, pro-business, fiscal conservatism, Atlanticist foreign policy, electability über alles

Key groups:

• Progress: Blairite think tank and campaign group, advocates market-friendly policies and strong defence
• Labour First: Centrist faction focused on winning elections and opposing the left
• Labour Together: Post-Blair centrist group, less ideological than Progress but still centre-right

Policy priorities:

• Economic: Pro-business, low corporation tax, fiscal discipline, private sector partnerships (PFI-style)
• Foreign policy: Strong NATO support, pro-Israel, interventionist (supported Iraq War)
• Social: Means-tested welfare, academy schools, NHS reform with private sector involvement

Key figures: Tony Blair (former PM), Peter Mandelson, Wes Streeting (Health Secretary), Liz Kendall, Jess Phillips (though Phillips is more socially liberal than economically Blairite)

Strength: Influential in media and think tanks, some MPs, but less dominant than under Blair; Starmer has adopted some Blairite messaging but is more cautious on economics

Trajectory under Starmer: Partially rehabilitated after Corbyn era, but Starmer has not fully embraced Blairism; some Blairites frustrated by Starmer's caution

Historical Context: Labour's Factional Wars

Labour's factions have fought for control since the party's founding in 1900, but the modern factional map was shaped by three key periods:

1. The 1980s: Militant, Kinnock, and the Hard Left Purge

The 1980s were Labour's most turbulent decade, defined by the rise and fall of the hard left:

• 1979-1983: After Labour's 1979 election defeat, the left (led by Tony Benn) gained influence, pushing for unilateral nuclear disarmament, withdrawal from the EEC, and mass nationalisation
• 1981: The Bennite left nearly won control of the party; moderate MPs split to form the Social Democratic Party (SDP), taking 28 MPs with them
• 1983 manifesto: Labour's left-wing manifesto (dubbed "the longest suicide note in history" by Gerald Kaufman) led to a catastrophic election defeat under Michael Foot
• 1983-1992: Neil Kinnock became leader and waged war on the Militant Tendency, a Trotskyist entryist group that controlled Liverpool City Council. Kinnock expelled Militant members and moved Labour toward the centre, but lost the 1987 and 1992 elections

Legacy: The 1980s trauma convinced many in Labour that the left was unelectable, shaping the Blairite project

2. The 1990s-2000s: New Labour and the Blairite Ascendancy

The New Labour era (1994-2010) saw the centre-right dominate:

• 1994: Tony Blair became leader after John Smith's death and launched the New Labour project, rebranding the party as pro-business, fiscally responsible, and tough on crime
• 1995: Blair rewrote Clause IV of Labour's constitution, removing the commitment to "common ownership of the means of production" (i.e., nationalisation)
• 1997-2010: Labour won three elections under Blair (1997, 2001, 2005) and one under Gordon Brown (2010, though Brown lost). New Labour accepted Thatcherite economics, embraced globalisation, and pursued an interventionist foreign policy (Kosovo, Afghanistan, Iraq)
• Factional dominance: The Blairites controlled the party machinery, sidelined the left (which was reduced to around 20 MPs in the Socialist Campaign Group), and enforced message discipline

Legacy: New Labour proved the centre could win elections, but the Iraq War, financial crisis, and austerity discredited Blairism among the membership

3. The 2010s: Corbyn, the Membership Surge, and the Left's Revenge

The 2010s saw the most dramatic factional reversal in Labour's history:

• 2010-2015: After Labour's 2010 defeat, Ed Miliband (soft left) became leader, defeating his Blairite brother David. Miliband moved Labour slightly left but lost the 2015 election
• 2015 leadership election: Jeremy Corbyn, a backbench socialist, entered the race as a token left candidate. A rule change allowing £3 registered supporters to vote led to a surge of new members, and Corbyn won with 59.5% of the vote, shocking the party establishment
• 2015-2020: Corbyn's leadership was defined by:
• Mass membership growth: Labour's membership rose from 190,000 (2015) to 580,000 (2017), making it the largest party in Western Europe
• 2017 election surge: Labour won 40% of the vote (up from 30% in 2015), gaining 30 seats and denying the Conservatives a majority—a result that shocked Corbyn's critics
• 2019 election collapse: Labour won only 32% of the vote and lost 60 seats, its worst result since 1935, due to Brexit divisions and Corbyn's unpopularity
• Factional warfare: Corbyn faced constant rebellions from Labour MPs, leadership challenges (Owen Smith in 2016, which Corbyn won with 61.8%), and media hostility
• Antisemitism crisis: Labour was investigated by the Equality and Human Rights Commission (EHRC) for institutional antisemitism, which found the party had broken equality law

Legacy: The Corbyn era proved the left could win leadership elections and mobilise members, but also exposed deep divisions and electoral vulnerabilities

The Starmer Era: Reassertion of Control (2020-Present)

Keir Starmer became leader in April 2020, promising to unite the party while keeping Corbyn's 2019 manifesto pledges. In practice, Starmer has systematically marginalised the left:

Rule changes and party democracy

• 2021: Starmer increased the nomination threshold for leadership challenges from 10% to 20% of MPs, making it harder for left-wing candidates to run
• 2022: Starmer abolished One Member One Vote (OMOV) for leadership elections, reintroducing an electoral college that gives MPs and unions more power (though this was later reversed after union pressure)
• 2023: Starmer's allies changed candidate selection rules to give the National Executive Committee (NEC) more power to block left-wing candidates

Purges and suspensions

• October 2020: Corbyn had the whip removed after saying antisemitism concerns were "overstated for political reasons"; Starmer refused to restore it despite Corbyn's readmission to the party
• 2021-2024: Several left-wing MPs were blocked from standing as Labour candidates, including Diane Abbott (eventually reinstated after backlash), Faiza Shaheen, and Lloyd Russell-Moyle
• 2024: Labour blocked Corbyn from standing in Islington North; he ran as an independent and won with 49.6% of the vote

Policy shifts