This article exposes comparable social mechanisms that have generated the social construction of threatening immigrants in Europe in the thirties and in the eighties. The analysis is building on Bourdieu 's theory of the construction of social space and the genesis of social groups. This semiotic-praxiological approach is used to explain why the specific historical and socio-economical conditions in the thirties and eighties have lead to the construction of Jews and Muslims as threatening immigrants. Our discussion focuses on the exemplary caseof the 'migrant problem' in historical and actual political discourse in Flanders (Belgium). Where at the end of the thirties the notion 'immigrant' referred exclusively to Jews, in the eighties it is used for Turkish and Maroccan 'guestworkers'. In spite of the specific historical and social situation of Jewish and Muslim immigrants parallel social mechanisms and discourses emerge in the redrawing of the social space by creating 'theatening' immigrants/strangers. These mechanisms are a religious anti Judaism/anti-Islamism, rapid social economie change fueling an economical argumented antiJew/anti-muslim and (cultural) racism legitimized by an internationally disseminated ethno-nationalism.