Arthur Lewis Horner (5 April 1894 – 4 September 1968) was a Welsh trade union leader and communist politician. During his periods of office as President of the South Wales Miners Federation (SWMF) from 1936, and as General Secretary of the National Union of Mineworkers (NUM) from 1946, he became one of the most prominent and influential communists in British public life. Source: Wikipedia (en)