In her tidy trailer, the widow dabs at her eyes. She loved [Walter S. Kasza] for more than four decades ... and Stella Kasza wants you to know that, damn it, he existed. He died in April 1995, a wraith, 73 years old. Bill Clinton did not kill Wally Kasza, but he has been forced to deal with his widow. The administration maintains an abiding interest in the lawsuit Stella Kasza has brought against the federal government. Under a presidential determination" that he must renew annually, Clinton has decreed that potential evidence related to Kasza's death is classified, top-secret, a matter of national security. Why should Wally Kasza matter? He was a sheet-metal worker. For seven years he put up buildings and installed cooling systems for a defense contractor at an Air Force base. Stella Kasza and the rest of America know [that base] as Area 51. What's being covered up there, according to lawsuits filed by Kasza's widow, another worker's widow and five former Area 51 employees, are brazen environmental crimes. For several years, the workers say, they labored in thick, choking clouds of poisonous smoke as hazardous wastes were burned in huge open trenches on the base. Another sheet-metal worker at Area 51, Robert Frost, died at age 57. Biopsies showed that his tissues were filled with industrial toxins rarely seen in humans. What is the government's response to these stories? Nothing. The policy is that nothing illegal occurred at Area 51 because, officially, nothing occurs at Area 51.