Workers, comrades, and you, women of the people, let not this festival of May, the second during the war, pass without protest against the Imperialist Slaughter.

He continued to be a major critic of the Social-Democratic leadership under Karl Kautsky and its decision to acquiesce in going to war. Liebknecht's parents were second cousins; his maternal great-grandmother was the sister of one of his paternal great-grandfathers. See also
Luxemburgism
Ture Nerman & Zeth Höglund
Karl Liebknecht (film).

Liebknecht and Luxemburg were murdered. [About this sound] Karl Liebknecht (help·info) (13 August 1871 Leipzig Saxony Germany – 15 January 1919 Berlin Germany) was a German socialist and a co-founder with Rosa Luxemburg of the Spartacist League and the Communist Party of Germany.