Matthew G. Unglesbee, 37, of Quincy, Illinois, was charged in federal court with mailing threatening communications and mailing false information and hoaxes

From the articleMan charged with mailing threatening letters with white substance to members of CongressAlso in Quincy, Illinois, man charged with sending white powder to Chicago area members of Congress, Illinois man charged with sending threatening letters to US lawmakers | Reuters, Four hoax letters to Congress draw federal charges - Roll Call