January 15, 1919: Comrades Rosa Luxemburg and Karl Liebknecht are murdered in Berlin.

The two were leaders of the revolutionary Spartacus League during World War I and founding members of the Communist Party of Germany.

The militarist right-wing Freikorps and the opportunist Social-Democratic government of Ebert and Noske collaborated in plotting their arrest and assassination as part of their effort to crush the revolutionary struggle known as the Spartacist Uprising (January 4-15, 1919).

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“Order prevails in Berlin!” You foolish lackeys! Your “order” is built on sand. Tomorrow the revolution will “rise up again, clashing its weapons,” and to your horror it will proclaim with trumpets blazing: I was, I am, I shall be!

- From Rosa Luxemburg’s last known article, written hours before her arrest and murder