On Ruling Migrants. Some Recents Studies on Migrations, Borders and Subjectification ABSTRACT: Migratory mobility, analyzed in relation with the present transitions in the areas of power and knowledge, is an emblematic representation of the ongoing flux of movement which characterizes global society. This aspect stands out if we look at the documents of the main international organizations but also it we analyze the « border ’s biopolitics » implemented by the European Union, meant to give value to migrants’ mobility. But while in the process of European constitutionalization citizenship turns out to be both inclusive and exclusive, because of the discriminatory character of borders, the process of migrants’ subjectification have weakly shown that the process through which citizenship is being build may turn out to be an area of conflict and protest.