While restrictions on human movement are increasing, restrictions on the movement of capital are diminishing. They are used to prevent us from acting on our desires unless our desires have become perverted and trapped within the cycle of production and consumption. The free movement of individuals has always been a threat to productivity, the willfully idle vagabond uses mobility to escape the grind of work and the wandering worker can use mobility as an advantage over his boss. The free movement through space is a threat to the state because it threatens any control over space. Complete free movement through space would not only threaten the nation-state but all private property.
Mobility is our power.
Griffen, William B. Apaches at War and Peace. Hu De-Hart, Evelyn. Traduccion Zulai Marcela Fuentes Ortega. Rabinow, Paul ed. The Foucault Reader.