Today the mobility of labor power and migratory movements is extraordinarily diffuse and difficult to grasp. Even the most significant population movements of modernity (including the black and white Atlantic migrations) constitute lilliputian events with respect to the enormous population transfers of our times. A specter haunts the world and it is the specter of migration. All the powers of the old world are allied in a merciless operation against it, but the movement is irresistible. Along with the flight from the so called Third World there are flows of political refugees and transfers of intellectual labor power, in addition to the massive movements of the agricultural, manufacturing, and service proletariat. The legal and documented movements are dwarfed by clandestine migrations: the borders of national sovereignty are sieves, and every attempt at complete regulation runs up against violent pressure. Economists attempt to explain this phenomenon by presenting their equations and models, which even if they were complete would not explain that irrepressible desire for free movement. In effect, what pushes from behind is, negatively, desertion from the miserable cultural and material conditions of imperial reproduction; but positively, what pulls forward is the wealth of desire and the accumulation of expressive and productive capacities that the processes ofglobalization have determined in the consciousness of every individual and social group—and thus a certain hope. Desertion and exodus are a powerful form of class struggle within and against imperial postmodernity. This mobility, however, still constitutes a spontaneous level ofstruggle, and, as we noted earlier, it most often leads today to a new rootless condition of poverty and misery.