Don't hate the FBI  - KILL the FBI An anarchist using the online moniker “Professor Rat” has threatened the lives of two federal terrorism investigators in Denver, advocating that they “need killing.” The threats name an FBI agent assigned to the local multiagency Joint Terrorism Task Force and the government’s lead prosecutor of terrorism cases in Colorado. Officials say they are concerned about the threats, which were sent to an e-mail listserv and posted on the Internet in April. “The recipients of the threats have no way to discern their validity,” said Jeff Dorschner, spokesman for the U.S. attorney’s office. "They cause fear and they disrupt lives, and it’s for that reason that they’re taken very seriously. “It’s more than the individual targets. It’s the families and those associated with them,” he said. That is the purpose of the postings, an Australian man who admits to using the Professor Rat name and to posting these kinds of threats said in a telephone interview and a series of e-mails: To scare people out of working for the government.