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In April 1977 a group of women in Argentina held the first ever public demonstration to demand the release of thousands of opponents of the military regime. It was the start of a long campaign by the women, who became known as the Mothers of the Plaza de Mayo. In 2017 Mike Lanchin spoke to Mirta Baravalle who has spent decades searching for her missing daughter and son-in-law, and for the grandchild she has never met. (Photo: Mirta Baravalle, with the photograph of her daughter, Ana Maria. Credit: BBC)