We know that communism is the right hypothesis. All those who abandon this hypothesis immediately resign themselves to the market economy, to parliamentary democracy - the form of state suited to capitalism - and to the inevitable and \'natural\' character of the most monstrous inequalities. Alain Badiou\'s formulation of the communist hypothesis has travelled around the world since it was first aired in early 2008, in his book, \"The Meaning of Sarkozy\". The hypothesis is partly a demand to reconceptualize communism after the twin deaths of the Soviet Union and neoliberalism, but also a fresh demand for universal emancipation. As third way reforms prove as empty in practice as in theory, Badiou\'s manifesto is a galvanizing call to arms that needs to be reckoned with by anyone concerned with the future of our planet.