Rosa Luxemburg, Mar 5 1871 – Jan 15 1919, is the great Marxist theorist, writer, economist, revolutionist, anti-war and anti-capital-punishment activist, and philosopher who was murdered during the German Revolution of 1918–1919.

Though she’s an anti-war activist, Luxemburg is also critical of the idea that a just society can be brought about by incremental reforms through established political systems. If she were to be involved in the 2016 Democratic primary race between Hillary Clinton and Bernie Sanders, she would very likely back Bernie, with his more revolutionary style and rhetoric: she’s sharply critical of the Social Democratic Party of Germany, to which she belongs (in its left wing) for favoring a Hillary-style reformist approach. However, her internationalism takes Marxist thinking beyond the point where leading Marxists of her day had progressed, with their focus on unique formulations of Marxist political theory tailored to their own particular national identities and histories. She would likely find fault, then, with Bernie’s protectionism.

Luxemburg’s other great contribution to…