"To all those who doubt philosophy today, to those who doubt that Marxism is able to take part in philosophy in a non-arbitrary or subjective way, but just and effective, I say: See what happens to your around! See how things are going fast! See those struggles in which young people are involved on the side of the elderly, battles in which Marxist theory emerges strengthened and rejuvenated! See how the mistakes of the past are corrected! See what perspectives open up before us, how the future approaches! Do you take sides in the class struggle, workers and popular? Remember: the class struggle needs philosophy, class struggle in theory ??. Do you aspire to be philosophers? Remember: the philosopher battles in theory, and when he understands the reasons for this necessary struggle, he joins the ranks of the class, workers and popular struggle. "Being a Marxist in philosophy, which Althusser wrote in 1976, consists of twenty-six short chapters in which a new understanding of the links between Marx and the practice of philosophy is sought. What does Marx have to say about philosophical practice? Is it possible to imagine a purely Marxist philosophy? What does it mean to practice philosophy as a Marxist? What political horizon could ?? and should ?? adopt a Marxist philosophy? In what way could a philosopher call himself a Marxist today? These are some of the questions that Althusser tries to answer in this book, in a clear, precise and meticulous text of exceptional elegance.