Rosa Roisinblit, an Argentine human-rights activist who fought to establish the truth about the fate of her pregnant daughter and thousands of others who were kidnapped by security personnel and “disappeared” during the country’s 1976-83 military dictatorship, died on Sept. 6 in Buenos Aires. She was 106.

Human rights groups have estimated that 30,000 Argentines were kidnapped, among them Mrs. Roisinblit’s 25-year-old daughter and her son-in-law, who were taken on Oct. 6 1978 when Patricia was eight months pregnant. Her infant son was given to a civilian Air Force intelligence officer and his wife. The boy was one of reportedly hundreds of those born in captivity who were, under false papers, transferred to childless military couples.

Mrs. Roisinblit joined a group called the Grandmothers of Plaza de Mayo who fought to find the stolen generation of children. According to the Grandmothers Group, about 300 grandchildren remain to be found; 140 have been given back to their families, including her grandson who was found on a tip in 2000 that a fast-food worker might be related to her. Tests proved positive.

At the age of 96 Mrs. Roisinblit had the satisfaction of facing in court the men charged with kidnapping her daughter and son-in-law. All three were found guilty and sentenced to prison.

“I want to find the remains of my children,” Mrs. Roisinblit said in court, “because then I’d have a place to lay a flower.”