Juanita Castro was disillusioned with the injustice that grew out of the Cuban revolution. So when the CIA approached her after the failed Bay of Pigs invasion and asked her to help protect its Cuban agents, she agreed. Details about her time with the agency are revealed in Castro’s new book, “My Brothers Fidel and Raul, the Secret History.” According to the memoir, she received her missions via coded messages on the radio, and worked under the condition that she would not commit violence against her brothers. Castro says she refused any payment, but remained with the CIA through the Cuban Missile crisis and in the years after she became an exile in Miami. The agency hasn’t commented on her claims.