What can contemporary activists and political theorists learn from the life and work of Rosa Luxemburg? Examining her contribution to radical democracy and revolutionary socialism, Jon Nixon shows why Red Rosa's legacy lives on. Luxemburg's political and intellectual formation was in itself a 'long revolution', conceived of over time and in response to world events; her groundbreaking ideas around internationalism and spontaneity were formulated in the context of revolution. Returning to her thinking on global capitalism, democratic renewal, state militarism, and the social question, Nixon draws out the enduring nature of her work, using her framework of ideas as a lens through which to view the contemporary debates. By establishing a rich and distinctive account of Luxemburg, Nixon makes the argument for why her struggle for democratic renewal is as relevant as ever.