Structural Marxism (or structuralist Marxism) is an approach to Marxism based on structuralism, primarily associated with the work of the French philosopher Louis Althusser and his students. It was influential in France during the late 1960s and 1970s, and also came to influence philosophers, political theorists and sociologists outside France during the 1970s. Structural Marxism arose in opposition to the humanist Marxism that dominated many universities in the West during the 1950s and 60s. In contrast to the humanist focus on the early works of Karl Marx, structural Marxism emphasizes the later, more structural works, such as Das Kapital, which Althusser argued represented a scientific break from Marx's earlier Hegelian humanism.

Because Althusser's thought was deeply rooted in the history of the French Communist Party (PCF), structural Marxism is often considered a politically-motivated theoretical intervention. Althusser's aim was to reconcile Marxism with the structuralist sciences of his day (such as the linguistics of Ferdinand de Saussure, the anthropology of Claude Lévi-Strauss, and the psychoanalysis of Jacques Lacan), creating a "third way" between the dogmatic dialectical materialism of the Stalinist era and the various humanist and existentialist Marxisms. His project was to re-establish Marxism as a science—"historical materialism"—by purging it of what he saw as its ideological, humanist and historicist elements.

Key concepts of structural Marxism include the idea of an "epistemological break" in Marx's thought, an anti-humanist view of history as a "process without a subject", and the concepts of overdetermination and relative autonomy of the superstructures from the economic base. In his later work, Althusser developed his theory of ideology and the process of "interpellation" to explain how subjects are constituted within social structures. The school of thought had a significant influence on figures such as Nicos Poulantzas, Étienne Balibar, and Pierre Macherey. However, it faced sustained criticism from other Marxist traditions, notably from historians like E. P. Thompson who accused it of being a form of idealism and Stalinism. By the late 1970s, the movement declined due to both internal theoretical problems and the rise of post-structuralism, with many of Althusser's own students becoming prominent critics.

Intellectual and political context Louis Althusser's project emerged from a specific intellectual and political conjuncture in post-war France, defined by the political crises of the Communist movement and major shifts in French philosophy.

Post-war French Marxism After World War II, Marxist philosophy in France was largely divided between two trends. The first was the "orthodox" Marxism of the French Communist Party (PCF), which was codified into a dogmatic system known as dialectical materialism or "diamat". After being ejected from government in 1947 and with the onset of the Cold War, the PCF retreated into a "Stalinist fortress", loyally executing the demands of the Cominform and promoting a quasi-"third-period" rhetoric. This system treated Marxism as a universal "world-view" with laws applicable to both nature and history, often serving to legitimize the political line of the Soviet Union. The official philosophy of the PCF left little room for serious philosophical work, instead subordinating theoretical inquiry to the legitimation of party policy.

The second trend was a reaction against this orthodoxy, taking the form of Marxist humanism and often blending Marxism with existentialism and phenomenology. Thinkers like Jean-Paul Sartre and Maurice Merleau-Ponty, particularly after their experiences in the French Resistance, sought to develop a Marxism that emphasized human subjectivity, lived experience, and creative practice (praxis). This approach was part of a broader "Hegelian Marxist" current that emerged after World War I with the work of Georg Lukács and Karl Korsch, who reacted against the mechanistic and deterministic Marxism of the Second International by returning to Hegel and emphasizing class consciousness. This trend was given a new impetus by the discovery and publication in the post-war years of Karl Marx's early works, particularly the Economic and Philosophic Manuscripts of 1844 and the Grundrisse, which were saturated with Hegelian and humanist themes. Another important influence on post-war French Marxism was Alexandre Kojève's lectures on Hegel, which interpreted Hegel through a Marxist lens and emphasized themes such as the end of history and the master–slave dialectic. The humanist Marxists rejected the scientific and determinist "iron laws" of dialectical materialism, arguing that Stalinism's theoretical naturalism denied the specificity of human history as the product of creative human agency. Their philosophy was "subject-centered", rooted in the lived experience of the historical actor as the source of both history and knowledge.

This intellectual environment was transformed by two major political events. First, Nikita Khrushchev's "Secret Speech" at the Twentieth Congress of the CPSU in 1956, which denounced the crimes of the Stalin era, created a crisis within Western Communist Parties that Althusser later described as an "earthquake". This "de-Stalinization" opened up a new space for criticism and intellectual freedom, allowing for critical encounters with both Marxist orthodoxy and non-Marxist traditions. Second, the Sino-Soviet split provided an alternative model of socialist construction in China and introduced the theoretical work of Mao Zedong into European debates. For many commentators, the Sino-Soviet dispute was the "real political background" to Althusser's work.

The rise of structuralism By the late 1950s and early 1960s, the intellectual tide in France turned away from the subject-centered philosophies of existentialism and phenomenology toward structuralism. This shift was characterized as a move from the legacy of the "three H's" (Hegel, Edmund Husserl, and Martin Heidegger) to that of the three "masters of suspicion" (Marx, Friedrich Nietzsche, and Sigmund Freud). The principal source of this movement was the structural linguistics of Ferdinand de Saussure, which emphasized that language is a system of signs whose meaning is determined not by reference to an external reality or the intention of a speaker, but by the internal relations of difference within the linguistic system.

This approach was extended to other fields, radically challenging the idea of the autonomous, meaning-creating human subject: In anthropology, Claude Lévi-Strauss analyzed myths, kinship, and other social practices as "codes" governed by underlying structural rules, analogous to language. History was not the product of conscious human projects but was determined by the totality of these rule systems. In psychoanalysis, Jacques Lacan reinterpreted Freud through structural linguistics, arguing that "the unconscious is structured like a language". The sovereign, conscious self of Cartesian philosophy was displaced by a subject constituted through its entry into a pre-existing "symbolic order".

The common theme of structuralism was the "decentering of the subject": the human subject was no longer seen as the source of meaning, but as an effect, a "prisoner of meaning" constituted by external structures (linguistic, cultural, or unconscious). This provided Althusser with powerful tools to criticize the humanist Marxisms of Sartre and others.

Althusser's intervention

Althusser's work in the early 1960s, collected in For Marx and Reading Capital (both 1965), constituted a decisive intervention into this context. As a philosopher and member of the PCF, he sought to chart a "third way" that was neither the dogmatic scientism of Stalinism nor the philosophical humanism of its critics. He did this by denying that humanist Marxism was authentically Marxist at all. Instead, he argued that Marxism was a science—historical materialism—and that its scientificity had been established by Marx himself in a radical break from his early humanist and Hegelian writings.

To make this case, Althusser allied with structuralism and another French intellectual tradition, the "historical epistemology" of philosophers of science like Gaston Bachelard. From Bachelard, he borrowed the concept of the "epistemological break" (coupure épistémologique), a discontinuous rupture that separates a new science from its ideological prehistory. Althusser's project was to use these tools to purify Marxism of its ideological elements and re-establish it on a scientific footing. This intervention was simultaneously political: it was conceived as a left-wing critique of Stalinism that, unlike humanism, did not abandon the theoretical tools needed to analyze Stalinism as a historical reality, and as a theoretical opposition to the "rightist" tendencies of reformism and opportunism which he saw growing within the PCF.

Key concepts Althusser's project involved a fundamental re-reading of Marx and a re-conceptualization of historical materialism as a science. This produced a distinct set of theoretical concepts that defined the structural Marxist school.

Science versus ideology The central theoretical move in Althusser's work is a rigid distinction between science and ideology. Drawing on the historical epistemology of Gaston Bachelard, Althusser argued that science is not the opposite of ignorance, but of a "tenacious web of error" embodied in ideology. This distinction is elaborated through two key concepts:

Epistemological break (coupure épistémologique): Althusser argued that the history of a science is marked by a radical, discontinuous "break" that separates the new scientific field from its "pre-scientific" ideological past. He located such a break in Marx's own intellectual development around 1845, with works like The German Ideology and the Theses on Feuerbach. According to Althusser, these texts mark Marx's definitive rupture with his early, "ideological" works, which were dominated by Hegelian and Feuerbachian humanism, and the founding of a new science: historical materialism. Consequently, the early writings of Marx (such as the Economic and Philosophic Manuscripts of 1844) were not to be considered part of scientific Marxism, but belonged to its prehistory. One political interpretation of this theoretical move is that it allowed Althusser to "neatly eliminate" questions concerning alienation and the nature of work which were "embarrassing to the Soviet state". Problematic: The epistemological break is understood as a change in the fundamental "problematic" of a discourse. A problematic is not simply a set of ideas, but the underlying theoretical framework—the "objective internal reference system...the system of questions commanding the answers given"—that determines what can be thought and said within a particular discourse. A scientific problematic is "open," capable of development, whereas an ideological problematic is "closed," dominated by its service to extra-theoretical, "practico-social" functions. The break in Marx's work was therefore a shift from the humanist problematic of alienation and human essence to the scientific problematic of concepts like mode of production, social formation, and class struggle. To identify a text's problematic, Althusser proposed a method of "symptomatic reading", borrowed from Freud, which seeks to uncover the text's unspoken assumptions, "silences", and the "undivulged event" that structures its content.

Anti-humanism and anti-historicism Based on this epistemological break, Althusser mounted a critique of two tendencies he saw as ideological deviations within Marxism: theoretical humanism and historicism.