The party was founded during the Spanish Second Republic and became established under the leadership of Gaietà Huguet, in Castellón. In 1935, he impelled a merging with the party Esquerra Valenciana ("Valencian Left", EV), founded in 1934 and led by Vicent Marco Miranda (ex-Mayor of Valencia), Josep Benedito, Miquel Duran de València and Manuel Sanchís-Guarner. After Vicent Marco obtained in 1936 the act of deputy in Valencia within the candidatures of the Popular Front both parties joint in a common parliamentary group in the Spanish Congress with the name of Catalan Left.