Cuban Espionage

Cuban-American citizen Ana Montes was convicted of providing tons of high level intelligence to her Cuban spy masters. This opponent of American policy in Latin America infiltrated the upper echelons of our intelligence system and went undetected for years. Her activities did serious damage to the United States and may have cost lives. She had access to senior level decision makers and to very sensitive information, which allowed the Cubans to counter American efforts. Read about how and why she became a spy, how she transmitted information to Cuba, her strained relations with the family, and how she was tracked and caught.

http://www.washingtonpost.com/sf/feature/wp/2013/04/18/ana-montes-did-much-harm-spying-for-cuba-chances-are-you-havent-heard-of-her/?hpid=z5