Who changed SOCIAL DEMOCRATIC PART to Communist Party?

The Social Democratic Party of Germany (SPD) transformed into a more radical faction, leading to the establishment of the Communist Party of Germany (KPD) in 1918-1919. This shift was largely influenced by the revolutionary climate in Germany following World War I and the Bolshevik Revolution in Russia. Key figures in this transition included Karl Liebknecht and Rosa Luxemburg, who advocated for a more revolutionary approach to socialism, ultimately leading to the split from the SPD.