In 1986, with contractors stealing an estimated 10 percent of the total federal budget by fraud, Congress passed a newly strengthened anticorruption law. Ordinary citizens could file lawsuits on behalf of the government to recover money stolen from the public treasury, and they would share in the result. In the years since, the False Claims Act has emerged as one of the nation's most potent weapons against corporate greed. Giantkillers is the story...