During the 1890s, the young Brazilian republic suffered from almost constant political and economic turbulence. Various civilian and military groups contended for power, while rapidly rising prices aggravated urban unrest. At the same time, increasing numbers of European immigrants entered Brazil, and, as in other Latin American countries, became a source of controversy (see Solberg, 1970). Some immigrants, such as Italian or Spanish anarchists, were themselves radical, and some opposition to immigrants came from conservative elements of Brazilian society. But the most vehement anti-immigrant outbursts of the inflation-ridden 1890s issued from radical nationalist sectors. The Portuguese, members of the largest foreign colony in Rio de Janeiro, became targets for virulent attacks by a little-known group who styled themselvesJacobinos. Both the ultranationalistic Jacobinos and the Portuguese, orGalegos, as they were scornfully termed, viewed each other as the most dangerous enemy they faced. After examining some aspects of Portuguese immigration to Brazil and the origins of Lusophobia, this article will focus on Jacobino criticisms and activities, which can best be understood within the specific economic and political context of the 1890s.