The article examines the reasons that prompted the governments and expert circles of many EU countries to pay increased attention in the past two years to the activities of the Muslim Brotherhood (BM) religious and political association within the EU. According to the author, this is due not only to the terrorist attacks of Islamists in France and Austria in 2020, but also to the manifestations of the growing influence of this category of Muslim organizations and groups on the social and political life of the countries of the Old World. The article focuses on the analysis of the means, methods and mechanisms characteristic of the groupings associated with the structures of the Muslim Brotherhood in Europe, on their differences from similar organizations in the Middle East. The author turns to the history of the emergence and growth of the influence of the «brothers» in Europe in order to more thoroughly examine the phenomenon of today: while the authority and influence of the BM are noticeably falling in the Arab countries, in the Old World the situation is different for the «brothers» – in many cases they manage to hide their Islamist essence under the cover of left, «progressive» rhetoric, which allows them to fit into the current political and ideological discourse in the host countries. However, with the aggravation of intercivilizational relations in Europe, BM groups are increasingly forced to leave their traditional «hiding places», publicly claiming the status of «defenders of discredited Muslims», but in fact trying to legalize their radical views and positions. The resulting scale of their presence and influence in European societies noticeably frightens the establishment and the population of these countries. The author comes to the conclusion that at the current stage, an aggravation of the confrontation between the political elites in the EU countries and the BM structures is inevitable