Investigative reporter David Burnham. His new book, "A Law Unto Itself: Power, Politics and the IRS," takes a critical look at the Internal Revenue Service, which Burnham calls "the single most powerful instrument of social control in the United States." Burnham's previous book, "The Rise of the Computer State," is about the threat to democracy posed by the collection and storage of data by government agencies. He's also done investigative reporting on police corruption in New York City, and was the reporter Karen Silkwood was on her way to talk to about abuses in the nuclear power industry when she was killed in a car accident. ("A Law Unto Itself" is published by Random House).