Unified Popular Action Front (in Spanish: Frente de Acción Popular Unificada) was a revolutionary mass front in El Salvador, linked to the Fuerzas Armadas de la Resistencia Nacional. FAPU was formed in 1974. It consisted of trade union, student, peasants and teachers organizations.
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In 1980 FAPU was one of the founding organizations of Coordinadora Revolucionaria de Masas.