Grandmother of Plaza de Mayo Blanca Díaz de Garnier died Sunday in the city of Concepción del Uruguay, Entre Ríos. She was 91.

Grandmothers of Plaza de Mayo is a human rights organization founded in 1977 by the grandmothers of people illegally taken from their parents as newborn babies — or born under captivity — during Argentina’s last dictatorship (1976-1983) and raised under a false identity.

After a 40 year-search, Díaz de Garnier was reunited with her granddaughter, Adriana Garnier Ortolani, in December 2017. Adriana was born in January 1977 while her mother Violeta Ortolani was in captivity in La Plata city, Buenos Aires province. Díaz de Garnier’s son, Edgardo Garnier, was kidnapped in February 1977, and has never been found.

Shortly after the kidnapping of her daughter-in-law and son, Díaz de Garnier and her family — like many others — began to look for them in ministries, churches, hospitals, and police stations. It was during this ordeal that they met other Mothers and Grandmothers of Plaza de Mayo.

“The desire, need and hope to find her is always there,” she said in reference to her granddaughter, before they were reunited.

When Adriana finally appeared, she immediately wanted to meet her grandmother. “Somebody told me my parents weren’t my real parents,” Adriana said in a TV spot for the Grandmothers. “I found out I had a grandmother, and it was an incredible sensation. I met Blanca, and we could give each other that long-awaited hug”

The grandmothers, with the help of cutting-edge scientific techniques from the National Bank of Genetic Data, have already identified 133 illegally appropriated grandchildren. The last identification happened on July 28.