[2] Sirgo was born on 20 January 1930 into a family of miners politically committed to communism and without the possibility of accessing education.
With the end of the Civil War and the fall of the Second Republic, her father fled to the mountains to join the resistance, while her mother was detained in Arnao prison, a fate that other relatives also suffered.
At the age of twelve, she was discovered and arrested by the Civil Guard along with other family members, including her mother and her uncle, Fidel Suárez Campurru.
[6] In addition, Siro participated decisively in the organization of clandestine women's groups during the strike, with the collaboration of women such as Tina Pérez and Celestina Marrón.These groups were responsible, among other things, for collecting aid in the form of food, transmitting messages or distributing leaflets.
[8] Under the principle of active non-violence, they tried to give visibility to the struggle throughout the Spanish territory and came to have the support of the auxiliary bishop of the time, Segundo García de la Sierra.