Right after 9-11? They killed a couple of people and probably scared us more than 9-11 did. The current suspect killed himself this week. The media breathlessly claimed that the anthrax used was traceable to Saddam Hussein. Much more quietly, that was proven false and the anthrax was shown to have come from a U. S. facility. The FBI originally accused another guy of it and ended up having to pay him $6 million. We didn't hear much after that. Glenn Greenwald goes into depth on this. There are still a lot of questions.