South Wales Miners' Federation

The South Wales Miners' Federation (SWMF), nicknamed "The Fed", was a trade union for coal miners in South Wales. Founded on 24 October 1898 following the defeat of the 1898 miners' strike, it emerged from the merger of ten local miners' unions to become one of the most powerful and influential trade unions in British history. The federation transformed South Wales from the least unionised major coalfield in Britain - with only 18% membership in 1897 - to achieving an unprecedented 87% workforce penetration by 1900.

The SWMF played a central role in some of the most significant industrial confrontations in British labour history, including the Cambrian Combine Dispute and Tonypandy Riots of 1910-11, the General Strike of 1926, and the 1984-85 miners' strike. The federation was instrumental in the political transformation of the South Wales coalfield, shifting from Liberal to Labour allegiance and becoming a centre of radical politics, with communities like Maerdy earning the nickname "Little Moscow" during the interwar period.

At its peak in the 1920s, the SWMF represented over 270,000 miners across South Wales and later extended its organisation to the Forest of Dean and Somerset Coalfield. The federation championed the cause of coal nationalisation from 1918 onwards, a goal finally achieved when the Labour government nationalised the industry in 1947. In 1945, the SWMF became the South Wales Area of the National Union of Mineworkers, with reduced autonomy but continued influence.

The union's decline paralleled that of the coal industry itself. The devastating defeat of the 1984-85 miners' strike opened the way for mass pit closures across the coalfield, effectively ending coal mining as the dominant industry in South Wales. Today, the organisation survives as the South Wales Area of the National Union of Mineworkers with just 64 members, a remnant of what was once one of Britain's most formidable trade unions and a defining institution of Welsh industrial society.