In 1934, the FSA-PSOE formed part of the workers' alliance formalised in the Uníos Hermanos Proletarios (UHP, Unite Proletarian Brothers) and agreed with the pact signed between the socialist trade union Unión General de Trabajadores (UGT, General Union of Workers) and the Regional Confederation of Labour of Asturias, León and Palencia of the anarcho-syndicalist organisation CNT.

On Sunday, 14 May 1978, Felipe González and Enrique Tierno Galván gave a rally in the El Molinón football stadium in Gijón attended by 25,000 people.

In 1991 he was succeeded by Juan Luis Rodríguez-Vigil Rubio, who resigned after the Petromocho scandal and was replaced by Antonio Trevín Lombán in 1993.

After a legislature in opposition, in 1999 the FSA, led by Vicente Álvarez Areces, once again gained access to the regional government - thanks in part to the instability generated by regional president Sergio Marqués' break with the PP, founding the Unión Renovadora Asturiana (URAS, Asturias Renewal Union) in 1998.

[9] In the PSOE crisis of 2016, a new leadership emerged in the FSA-PSOE that led to the 32nd congress and the election of Adrián Barbón as Secretary General on 1 October 2017.