The party obtained three deputies (3,5% of the votes) during the 1937 parliamentary elections.[3] It then merged in 1938 with the Unión Socialista (Socialist Union) to create the Alianza Popular Libertadora (APL) which supported General Carlos Ibáñez del Campo's candidacy for the 1938 presidential election. However, fascist elements attempted a coup in September 1938, which was ruthlessly put down at the Seguro Obrero massacre, and led Ibáñez to oppose the National Socialists' choice of Gustavo Ross, leading to indirect support of the Radical Party's candidate, Pedro Aguirre Cerda, who narrowly won the election.[4]