Juanita Castro, the anti-communist sister of Cuban rulers Fidel and Raul Castro, has died in Miami at the age of 90.

Cuban exiles were shocked by the news of her death earlier this week. It was Juanita who brought to light the complex and clandestine relationship she had with the CIA during its mission to overthrow the Cuban government in the 1960s.

Having dedicated her life to opposing the Castro regime, Juanita became an inspirational figure in the Cuban-American community in Miami. Shortly after her arrival in the U.S., the Cuban exile community had accused her of being a communist spy due to her connections with the CIA. Later, she even helped found a CIA-backed organization that actively worked against the government of her brothers, Fidel and Raul Castro, before settling in Miami, where she became an active member of the Cuban-American community. She became a naturalized U.S. citizen in 1984.

After years of working against Fidel and Raúl Castro, she publicly shared her sentiments about her brothers’ health problems. She expressed her sadness upon learning about Fidel’s 2006 health condition that drew celebrations in Little Havana in Miami, stating, “We are separated for political reasons, ideological reasons, but that’s it.” She also noted her sadness on the day Fidel Castro passed away in 2016.

Though they may have been ideological opposites, she expressed that they were still her family, and she respected the position of those who felt otherwise.