He and his wife, (Martha) Beatrice Webb (née Potter) (1858–1943), whom he married in 1892, were prominent members of the Fabian Society, and helped to establish the London School of Economics (1895). They wrote several important books on socio‐political theory and history, including The History of Trade Unionism (1894) and Industrial Democracy (1897), as well as founding the weekly magazine the New Statesman (1913). Sidney Webb became a Labour MP in 1922 and served in the first two Labour governments.