George Lansbury (pictured) became the leader of the opposition British Labour Party.

George Lansbury was a British politician and social reformer who led the Labour Party from 1932 to 1935. Apart from a brief period of ministerial office during the Labour government of 1929–31, he spent his political life campaigning against established authority and vested interests, his main causes being the promotion of social justice, women's rights, and world disarmament.

The Labour Party, often referred to as Labour, is a political party in the United Kingdom that sits on the centre-left of the political spectrum. The party has been described as an alliance of social democrats, democratic socialists and trade unionists. It is one of the two dominant political parties in the United Kingdom; the other being the Conservative Party. Labour has been led by Keir Starmer since 2020, who became Prime Minister of the United Kingdom following the 2024 general election. To date, there have been 12 Labour governments and seven different Labour Prime Ministers – MacDonald, Attlee, Wilson, Callaghan, Blair, Brown and Starmer.