On 15 January 1919, Rosa Luxemburg and Karl Liebknecht were brutally murdered in Berlin. This article examines the significance of their murders a century ago, and the continuing relevance of their lives and writings today. It begins by providing a brief summary of the history of Germany, from its establishment in 1871 through to the Weimar Republic after the First World War. This sets the context for the discussion of the Social Democratic Party and the establishment of the Communist Party and Spartacus League, and an examination of the roles played by Luxemburg and Liebknecht and the events that led to their murders. The final sections reflect on the legacy of their lives and contributions. The article argues their example and writings are great assets for all who participate in the struggle today for a better system — for socialism.