The Federal crime of Mailing Threatening Communications is defined by 18 U.S. Code § 876:
Threat
Arson Threats Charges in Iowa
The crime of Threats involving arson in Iowa is defined by Iowa Code Section 712.8 as follows:
Intimidation Charges in Illinois
The crime of intimidation in Illinois is defined by 720 ILCS 5/12-6 as is shown below: