Pérez Vera, Elisa Keywords: European Union | Citizenship | Aliens | Nationality | Mots clefs: European Union | Citizenship | Etrangers | Nationalité | ABSTRACT In this course, Elisa Pérez Vera, Professor at the Universidad Nacional de Educación a Distancia in Madrid, proposes to examine the various situations a person might face with regard to a political organization - or several organizations - (political party or not, member or non-member, national or foreigner) and that entail legal consequences on the international…