General Francisco Franco — himself a Galician from Ferrol — ruled as dictator from the civil war until his death in 1975. Franco's centralizing regime suppressed any official use of the Galician language, including the use of Galician names for newborns, although its everyday oral use was not forbidden. Among the attempts at resistance were small leftist guerrilla groups such as those led by José Castro Veiga ("El Piloto") and Benigno Andrade ("Foucellas"), both of whom were ultimately captured and executed. In the 1960s, ministers such as Manuel Fraga Iribarne introduced some reforms allowing technocrats affiliated with Opus Dei to modernize administration in a way that facilitated capitalist economic development. However, for decades Galicia was largely confined to the role of a supplier of raw materials and energy to the rest of Spain, causing environmental havoc and leading to a wave of migration to Venezuela and to various parts of Europe. Fenosa, the monopolistic supplier of electricity, built hydroelectric dams, flooding many Galician river valleys.