Friedrich Engels was a German philosopher, historian, and social scientist who co-founded Marxism with Karl Marx, shaping the course of modern socialism.
Max Stirner was a 19th-century German philosopher known for his radical individualism and critique of religion and nationalism.
Herbert Marcuse, a German-American philosopher and sociologist, was a prominent figure in the Frankfurt School, known for his critical theory and advocacy for radical politics, influencing the New Left movement.