 Complete the following phrase:  Karl Paul August Friedrich Liebknecht ; 13 August 1871  15 January 1919 was a German socialist politician and theorist, originally of the Social Democratic Party of Germany SPD and later a co-founder with Rosa Luxemburg of the Spartacist League and the Communist Party of Germany, which split from the SPD after World War I. He is best known for his opposition to the war in the Reichstag and his role in the 