Its main leaders were Marcelino Domingo, Álvaro de Albornoz, and Félix Gordón Ordás.
PRRS was an important force in the elections of 1931, winning 54 seats in the Cortes Generales that proclaimed the Second Spanish Republic on April 14.
In the meantime, it formed part of Prime Minister Manuel Azaña's coalition between Left Republican parties and the Spanish Socialist Workers' Party (PSOE); Álvaro de Albornoz was one of the architects of the secular legislation passed by the Cortes, and also served as Justice Minister.
In 1932, Juan Botella Asensi left the PRRS to found his own group (IRS, Izquierda Radical-Socialista – Radical-Socialist Left); the following year, it was split over the issue of collaboration with the PSOE: the left-wing, led by Domingo and Albornoz, argued for continued participation in government, while the right-wing of Gordón de Ordás favored an agreement with Lerroux's PRR.
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