During the second presidency of Julio A. Roca, the Law of Residency was passed, which allowed for the immediate expulsion from the country any foreign activists who were against the regime. Roca's brother-in-law, Miguel Juárez Celman, had been overthrown in the Revolution of the Park in 1890, and in 1905, radicalism would return to arms in a coordinated uprising in several provinces. In 1910, on the centennial celebration of the May Revolution, the Law of Social Defense was passed, establishing the preventative arrest of supposed anarchists.