William (Will) Crooks (6 April 1852- 5 June 1921) was a noted trade unionist and politician from Poplar, London, and a member of the Fabian Society. He is particularly remembered for his campaigning work against poverty and inequality.

Born in Shirbutt Street, Poplar, Crooks was the third son of a ship's stoker, George Crooks, who lost his arm in an accident when Crooks was three years old. His mother (Charlotte, a seamstress) then became the main breadwinner, but money was scarce and five of the children were temporarily forced to enter Poplar workhouse in 1861 – an experience that had a profound influence on Crooks' views on poverty.

Educated at a local Poor law school, Crooks worked initially as a grocer's errand boy, then a blacksmith's labourer and then as an apprentice cooper. A keen reader, Crooks learned about reformers such as Richard Cobden and John Bright, and was asked by his fellow workers to speak out about their working conditions. Consequently, he was sacked for being a political agitator (he remained a member of the Coopers Union from 1867 until his death in 1921).

After a short spell working in Liverpool, Crooks returned to London and found work in the docks. He also began to give political lectures, and his speaking abilities proved helpful in raising funds for 10,000 striking dockers in the 1889 London dock strike.

Earlier that year, Crooks, a candidate for the Progressive Party, successfully stood for election to the London County Council, and joined Sidney Webb and other labour movement leaders in the LCC. He also became the first working-class member, and later chairman, of the Poplar Board of Guardians. With support from friend and fellow member George Lansbury, Crooks set about reforming the local workhouse, creating a model for other Poor Law authorities.

A prominent local politician, he helped bring about many local improvements. On 3 August 1895, Crooks formally opened Island Gardens, a park at the south end of the Isle of Dogs, opposite Greenwich Hospital. He also campaigned for the first Blackwall Tunnel (1896), and later – as Chairman of the LCC Bridges Committee (1898), he helped provide the Greenwich and Woolwich foot tunnels (both completed in 1902).

In 1901 Crooks became the first Labour mayor of Poplar, and – two years later – was elected to Parliament as MP for Woolwich (after a pact between the Labour Representation Committee and the Liberal Party wrested the seat away from the Conservative Party). At the time, he was only the fourth Labour MP (preceded by James Keir Hardie, Richard Bell and David Shackleton; Arthur Henderson followed later in 1903).

As an MP, he retained his working-class roots and contacts, campaigned hard for workers' pensions, supported reforms to limit the powers of the House of Lords, and supported Balfour’s Unemployment Bill in 1905. Re-elected in 1906, he supported the reforming Liberal governments of Campbell-Bannerman (1906-1908) and Asquith (1908-1910).

Crooks briefly lost his seat in Parliament during 1910 but returned in December 1910, and remained an MP until ill-health forced his retirement in February 1921. He died in the London Hospital, Whitechapel four months later, and was buried in Tower Hamlets Cemetery.

In 1930, one of the Woolwich Ferry paddle-steamers was named in his memory (taken out of service in 1963). A council housing estate in his native Poplar still bears his name, as does a road in Eltham, just south of Woolwich.