This article aims to contribute to the widening of one of the most solidly established lines of research in Spanish historiography in recent decades: the one related to the evolution of Spanish socialism. Starting from a specific case study, correlated with the city of Bilbao between the end of the 19th and the beginning of the 20th century, the connections between two thematic fronts are addressed, which, however, have not received preferential attention in the numerous views perspectives deployed on the organised workers' movement. On the one hand, the dynamics that were glimpsed in the electoral trajectory of socialism at the local level, connected with voter mobilization efforts and the techniques and strategies applied by the political...