Municipal elections in 1931 were won by the anti-monarchy party formed by different left political parties with numerous affiliated people in the municipality because of its industrial and mining condition, with hundreds of workers. The corporatism in the region took place before war with the creation of many different associations of every kind, political and social. The war had as main stage mount Malmasín nearby, that hold many fights between gudaris brigades or soldiers led by the Basque Government and Franco's armies, these entered in the location 16 June 1937. Half of the population (2.000 people) run away, being able to return after.