Emmeline and Christabel Pankhurst expelled Sylvia Pankhurst for insubordination and she formed her own group that was left-wing and oriented to broader issues affecting working class women. It was first called the East London Federation of Suffragettes (ELFS), but over the years evolved politically and changed its name accordingly, first to the Women's Suffrage Federation and then to the Workers' Socialist Federation. The radical protests slowly became more violent, and included heckling, banging on doors, smashing shop windows, and arson. Emily Davison, a WSPU member, unexpectedly ran onto the track during the 1913 Epsom Derby and died under the King's horse. These tactics produced mixed results of sympathy and alienation. As many protesters were imprisoned and went on hunger-strike, the Liberal government was left with an embarrassing situation. From these political actions, the suffragists successfully created publicity around their institutional discrimination and sexism. Historians generally argue that the first stage of the militant suffragette movement under the Pankhursts in 1906 had a dramatic mobilizing effect on the suffrage movement. Women were thrilled and supportive of revolting in the streets; the membership of the militant WSPU and the older NUWSS overlapped and was mutually supportive. However a system of publicity, Ensor argues, had to continue to escalate to maintain its high visibility in the media. The hunger strikes and force-feeding did that. However the Pankhursts refused any advice and escalated their tactics. They turned to systematic disruption of Liberal Party meetings as well as physical violence in terms of damaging public buildings and arson. This went too far, as the overwhelming majority of suffragists pulled back and refused to follow because they could no longer defend the tactics. Shey increasingly repudiated the suffragettes as an obstacle to achieving suffrage, saying the militant suffragettes were now aiding the antis, and many historians agree. Searle says the methods of the suffragettes did succeed in damaging the Liberal party but failed to advance the cause of woman suffrage. When the Pankhursts decided to stop the militancy at the start of the war, and enthusiastically support the war effort, the movement split and their leadership role ended. Suffrage did come four years later, but the feminist movement in Britain permanently abandoned the militant tactics that had made the suffragettes famous. The First World War advanced the feminist cause, as women's sacrifices and paid employment were much appreciated. Prime Minister David Lloyd George was clear about