October 26, 2009 - By REUTERS - MIAMI (Reuters) - Using the codename “Donna,” the younger sister of Fidel and Raul Castro worked undercover for the CIA in Cuba in the early 1960s, helping opponents of their communist rule escape execution and imprisonment, she said in memoirs published in exile on Monday.

Revealing what the publishers called a closely guarded secret kept hidden for four decades, Juanita Castro described in the book how she was recruited by the U.S. Central Intelligence Agency in Havana two years after the 1959 Revolution led by her brothers, which she initially supported.

There was no immediate reaction to her revelation from the U.S. authorities or the Cuban government, which routinely dismisses critics as “mercenaries” in the pay of Washington.

Juanita Castro, 76, broke publicly with the Cuban government led by her brother Fidel Castro in 1964 after leaving Cuba for Mexico. She went into exile in Miami and has remained a strong critic of communist rule in Cuba.

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