The economic and political theories of Karl Marx and Friedrich Engels that hold that human actions and institutions are economically determined and that class struggle is needed to create historical change and that capitalism will ultimately be superseded by communism WordNet 3.0 & Open English WordNet

Marxism is a method of socioeconomic analysis that uses a materialist interpretation of historical development, better known as historical materialism, to understand class relations and social conflict and a dialectical perspective to view social transformation. Wikipedia

A philosophy and social theory stating that the class in control of the economy is also in control of politics. OmegaWiki

The socialist and communist theory of the followers of Karl Marx and Friedrich Engels; a radical, revolutionary political philosophy that aims to capture state power, introduce a dictatorship of the proletariat, and then progress to communism. Wiktionary