In: Segurança interna : desafios na sociedade de risco mundial / coord. Nuno Poiares, Rui Marta. - Lisboa : ISCPSI, 2018. ISBN 978-972-8630-27-0. p. 7-39.

Half a century ago, the Muslim Brotherhood reached the European Continent. Their expansion coincided with the increase in number of Muslims in European countries due to the import of labor from Islamic countries in the North Africa and Turkey, in addition to the waves of asylum seekers and illegal immigration and the increase in parity among Muslim populations. This group is active in Europe, deriving its legitimacy from Qur’an, Hadith and Sunna expounds. The ultimate end of these groups is to establish the Islamic state, Islamic caliphate and apply Islamic Sharia law. The Muslim Brotherhood succeeded in expanding horizontally and vertically inside Europe by increasing the number of organizations that work under different names and take the forms and titles of society organizations and the increase in branches of such organizations and institutions that expanded inside the Muslim communities in many European countries. Now, after all these years of work by the Muslim Brotherhood and other Islamic groups in Europe combined with the increase in the number of Muslims in Europe, there is a challenge before the European authorities represented in how to counter the activities of these groups which take shelter in the laws that secure freedom of speech, opinions and formation of associations. Despite the European intelligence reports that warn against the threat of these groups and the links between some of them and extremism and stringent thoughts, however, the European governments still lack the political will to counter these groups, fore and foremost, the Muslim Brotherhood.