One of the most prolific hoaxers was Clayton Waagner, an anti-abortion activist who mailed hundreds of anthrax hoax letters to abortion clinics in late 2001 and who was convicted in December 2003. A Sacramento man, Marc M. Keyser, admitted to sending around 120 packages marked as containing anthrax in October 2008, which he says was to highlight the lack of preparedness of the U.S. Department of Homeland Security and public for an anthrax attack. He was convicted in September 2009 of five counts of hoaxes and making threats and sentenced to four years in prison in late April 2010.