Rory Carroll and Giles Tremlett
London Guardian 
Tuesday, Oct 27th, 2009
To the CIA she was Donna: a Cuban spy who hid documents inside cans of food and sent secret messages via a clandestine radio and two tunes – a waltz and a song from the opera Madame Butterfly.
Today, Donna was revealed to the rest of the world as Juanita Castro – the sister of Fidel and Raúl, rulers of Cuba and legendary conquerors of US espionage efforts – when she blew the whistle on her career as a CIA agent.
The rogue sibling revealed extraordinary details of her hidden identity in a memoir, Fidel and Raúl, My Brothers: The Secret History, which could force a partial revision of the CIA’s role in Cuba. For half a century its efforts against Fidel were considered fiascos, prompting recrimination and ridicule. It tried and failed to kill him, tried and failed to invade Cuba, and tried and failed to foment revolt.
Cuba was just 90 miles off Florida, but its ruler was thought too wily and his regime too hermetic for the hapless American spies. Now, in what she describes as the family’s best-kept secret, Juanita has revealed that the CIA infiltrated the world’s most famous communist clan.