Marxism in these web pages is understood as the theory and practice of working class self-emancipation. This theoretical and political tradition is radically different from the way Marxism is generally described by both critics and many 'adherents' who identify Marxism with the repressive state capitalist regimes that used to dominate Russia and eastern Europe and still hold sway in China, North Korea, Vietnam and Cuba. David McNally explains in one of the chapters of Socialism from Below how this confusion came about, as a consequence of the defeat of the Russian revolution during the 1920s, and the consequences the defeat had for the international communist movement.
The following are some useful introductions to the classical Marxist tradition:
On the web