From its beginning, the Japan Socialist Party was a coalition of differing ideologies, which soon crystallized into two opposing factions. The initial leadership, including figures like Sakai Toshihiko, Katayama Sen, and
Tazoe Tetsuji, advocated for a moderate, parliamentary strategy. They believed in operating "within the limits of the law", focusing on achieving universal suffrage and electing representatives to the
Diet to bring about social change. This moderate consensus was shattered by the return of Kōtoku Shūsui from the United States in June 1906. His experiences abroad, particularly with the
anarcho-syndicalist Industrial Workers of the World (IWW), had convinced him that parliamentary politics was a futile "sop" designed to dupe the working class. On 28 June 1906, Kōtoku delivered a highly influential speech, "The Tide of the World Revolutionary Movement", to a large audience in
Kanda, Tokyo. He rejected the "peaceful, lawful, and constitutional" model of German
social democracy and instead called for by workers, culminating in a
general strike, as the only effective means to achieve a social revolution. Kōtoku's speech caused a major rift in the party, dividing it into two factions: • The , or "soft" faction, led by Katayama and Tazoe, which remained committed to social democracy and electoral politics. • The , or "hard" faction, led by Kōtoku, which advocated for revolutionary syndicalism and the rejection of parliamentary tactics. ==First annual convention==