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The Durruti Column (Spanish: Columna Durruti), with about 6,000 people, was the largest anarchist column (or military unit) formed during the Spanish Civil War.[1] During the first months of the war, it became the most recognized and popular military organisation fighting against Franco, and it is a symbol of the Spanish anarchist movement and its struggle to create an egalitarian society with elements of individualism and collectivism. The column included people from all over the world. Philosopher Simone Weil fought alongside Buenaventura Durruti in the Durruti Column, and her memories and experiences from the war can be found in her book, Écrits historiques et politiques. The Durruti Column was militarised in 1937, becoming part of the 26th Division on 28 April.
https://en.wikipedia.org/wiki/Durruti_Column