For 50 years, the CIA has served the nation gathering vital information, performing dangerous covert operations, and lending support to allies worldwide. But the vast secret agency has also seen its share of problems, and recent cases like the Aldrich Ames scandal have exposed them. THE 20th CENTURY traces the history of the CIA from its origins in 1947 through the disturbing revelations that have made many question its role toady. Dramatic footage and interviews with former agents, government officials and