She served as captain of the POUM militia during the Spanish Civil War in 1936, and was also active in the anarcha-feminist organization, Mujeres Libres.
Mika was born in 1902, in Moisés Ville, a small colony founded in 1889 in the province of Santa Fe, in Argentina, by Russian and Eastern-European Jews fleeing persecutions and pogroms.
Along with Eva Vives, Joan Pauna and other fellow activists, she created a group named after Louise Michel, the famous anarchist figure of the French commune.
[1] In 1920, while studying odontology at the University of Buenos Aires, she met her partner-to-be, Hipólito Etchebéhère,[2] then a member of an anarcho-communist group called "Insurrexit".
In 1924, inspired by the Russian Revolution, the couple decided to join the Communist Party of Argentina, before quickly being expelled in 1925[3] for their anarchist tendencies,[4] and their refusal to unilaterally condemn Leon Trotsky.
She then gave alphabetization classes and popular education in Madrid, in a hospital run by the Confederación Nacional del Trabajo.
[1] On March 28 1939, once Madrid had been defeated by the troops of Franco, she was able to take refuge in the city's French school, thanks to her passport, before leaving Spain for Paris.
In 1976, she published an autobiography, Ma Guerre d'Espagne à Moi ("My own Spanish Civil War"), a day-by-day description of life on the front line and in the minds of Republican fighters.