The Spanish government's new policy of hiring seasonal migrant workers has launched a new stage in the process of agricultural-worker substitution in the province of Huelva. Initially, the exodus of Spanish seasonal workers encouraged the arrival offoreign workers, principally Moroccans. Now, those workers, who came from the Maghreb region of north western Africa, are being displaced by female workers from Eastern Europe, primarily from Poland, Romania, and Bulgaria. This article analyzes the processes of labor exclusion of Maghreb workers, and the insertion and mobility of the female workers from Eastern Europe, who, nevertheless, are subjected to intense stigmatization by the local society. This has provoked an increase of interethnic conflict based on labor-market competition.