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In page Weimar Republic:

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In January, the Spartacus League, in what was known as the Spartacist uprising, took advantage of a large strike in Berlin and attempted to establish a communist government. The uprising was put down by paramilitary Freikorps units consisting of volunteer soldiers. Following bloody street fights, Rosa Luxemburg and Karl Liebknecht were summarily killed after their arrests on 15 January.[16] With the affirmation of Ebert, those responsible were not tried before a court-martial, leading to lenient sentences, which made Ebert unpopular among radical leftists.[citation needed]