Man charged with mailing threatening letters with white substance to members of Congress

A man in Illinois has been charged after mailing four threatening letters to members of Congress. Each envelope contained a white granular substance and included the sender's own name and home address. The legal proceedings follow the delivery of these materials to congressional representatives. This incident has led to formal charges against the individual involved in the mailing of the suspicious substances to the legislative body, as reported in the provided sources regarding the Illinois resident.