This video says about itself:
14 January 2016
On the 15th January 1919, Rosa Luxemburg and Karl Liebknecht were killed by members of the [extreme right paramilitary] Freikorps. The two German socialists were joint-founders of the Spartacist League and the Communist Party of Germany, and were captured following the Spartacist uprising that began on the 4th January.
Luxemburg and Liebknecht were members of the Social Democratic Party of Germany when Germany declared war in 1914. Frustrated by the wider SPD’s support for Germany’s declaration of war, they and other leftists created a separate organisation known as the Spartakusbund or Spartacus League. Named after the leader of the Roman Republic’s largest slave rebellion, the Spartacus League actively opposed the ongoing war. In 1916, both Luxemburg and Liebknecht were found guilty of high treason and imprisoned after they organised an anti-war demonstration.
From the World Socialist Web Site, 14 March 2016:
100 years ago: German revolutionary Karl Liebknecht denounces militarization of education
On March 18, 1916, Karl Liebknecht, the German revolutionary socialist and opponent of World War I, delivered a series of remarks in the German Reichstag, or parliament, denouncing the militarization of education and the glorification of war taking place in schools across the country. Liebknecht’s speech was one of a series in which he defied the Social Democratic majority, which had betrayed socialist internationalism by supporting the German war effort, and spoke out against the imperialist slaughter.
Liebknecht stated, “The ideal of classical education lies in the spirit of independence and humanity.” Addressing the government, and all of the pro-war parties, he said, “Your ideal of classical education is the ideal of the bayonet, of the bombshell, of poison gas and grenades, which are hurled down on peaceful cities, and the ideal of submarine warfare.”
He declared, “The higher schools are also used as practical helpers in the service of the present war. A systematic propaganda is conducted in them for the war loans, and gold is collected in them. … The schools are converted into training stables for the war. The physical upbuilding of the youth is encouraged now to attract new material for the Moloch, Militarism. Strengthening especially human health has thus as its aim the destruction of human life.”
He denounced the war propaganda promoted in schools, which focused exclusively on the crimes committed by Britain, France and the other Allied powers, and painted the actions of German imperialism in the brightest colors.
“In school must be taught, how this war arose, not only that the abominable murder of Sarajevo was an incident to inspire horror, but also the fact that the crime of Sarajevo was looked upon in many circles as a gift from Heaven, serving them as a war pretext,” he said. His reference to the fact that sections of the ruling elite had welcomed the assassination of Archduke Franz Ferdinand by a Serbian nationalist, seeing it as an opportunity to launch longstanding military plans, provoked outraged howls from the Conservative and opportunist Social Democratic deputies to the Reichstag.
Amid repeated interruptions, Liebknecht concluded with a call for a revolutionary struggle against the German government and the imperialist war, declaring, “To action! Those in the trenches, as well as those here at home, should put down their arms and turn against the common enemy, which takes from them light and air.” The president of the Reichstag called Liebknecht “to order” for the third time, and asked the deputies whether he should be allowed to continue to speak. Only a handful of socialist opponents of the war voted in favor.