Marxist philosophy  Marxist philosophy or Marxist theory are works in philosophy that are strongly influenced by Karl Marx's materialist approach to theory, or works written by Marxists. Marxist philosophy may be broadly divided into Western Marxism, which drew out of various sources, and the official philosophy in the Soviet Union, which enforced a rigid reading of Marx called dialectical materialism, in particular during the 1930s. Marxist philosophy is not a strictly defined sub-field of philosophy, because the diverse influence of Marxist theory has extended into fields as varied as aesthetics, ethics, ontology, epistemology, theoretical psychology and philosophy of science, as well as its obvious influence on political philosophy and the philosophy of history. The key characteristics of Marxism in philosophy are its materialism and its commitment to political practice as the end goal of all thought. The theory is also about the hustles of the proletariat and their reprimand of the bourgeoisie. Marxist theorist Louis Althusser, for example, defined philosophy as "class struggle in theory", thus radically separating himself from those who claimed philosophers could adopt a "God's eye view" as a purely neutral judge. The philosopher Étienne Balibar wrote in 1996 that "there is no Marxist philosophy and there never will be; on the other hand, Marx is more important for philosophy than ever before." So even the existence of Marxist philosophy is debatable (the answer may depend on what is meant by "philosophy," a complicated question in itself). Balibar's remark is intended to explain the significance of the final line of Karl Marx's 11 "Theses on Feuerbach" (1845), which can be read as an epitaph for philosophy: "The philosophers have only "interpreted" the world, in various ways; the point is to "change" it". If this claim (which Marx originally intended as a criticism of German Idealism and the more moderate Young Hegelians) is still more or less the case in the 21st century, as many Marxists would claim, then Marxist theory is in fact the practical continuation of the philosophical tradition, while much of philosophy is still politically irrelevant. Many critics, both philosophers outside Marxism and some Marxist philosophers, feel that this is too quick a dismissal of the post-Marxian philosophical tradition. Much sophisticated and important thought has taken place after the writing of Marx and Engels; much or perhaps even all of it has been influenced, subtly or overtly, by Marxism. Simply dismissing all philosophy as sophistry might condemn Marxism to a simplistic empiricism or economism, crippling it in practice and making it comically simplistic at the level of theory.