""Walter Kendall Myers spent more than two decades deep in the bureaucracy of the U.S. State Department until this week, when federal authorities accused him of a life of intrigue and espionage as a clandestine agent for one of the United States' longtime antagonists: the communist government of Cuba. The 72-year-old retired State Department employee -- who had enjoyed top-secret security clearance -- and his wife, Gwendolyn Steingraber Myers, 71, appeared in federal court Friday, charged with serving as illegal agents for Cuba for nearly 30 years and conspiring to deliver classified information to its government. They pleaded not guilty. According to documents unsealed Friday in Washington, Myers, a former analyst on Europe for the State Department, and his bank employee wife agreed in 1979 to deliver U.S. secrets to Cuba. Federal authorities called the couple's spying for Havana ``incredibly serious.''