In Marxism’s uneasy relationship with ethics a small number of prominent theorists considered it imperative to highlight the moral principles implicit in Marx’s social theory and to develop these ethics in the light of changing conditions. They developed a humanistic Marxism in stark contrast to the crude ‘end justifies the means’ approach of Stalinism. This collection brings together analyses by leading scholars on those thinkers who made significant contributions to ethical thinking within the Marxist tradition - Kautsky, Bloch, Fromm, Marcuse, Lefebvre, Macpherson and Heller.