The term “civil disorder” means any public disturbance involving acts of violence by assemblages of three or more persons, which causes an immediate danger of or results in damage or injury to the property or person of any other individual.

The term “commerce” means commerce (A) between any State or the District of Columbia and any place outside thereof; (B) between points within any State or the District of Columbia, but through any place outside thereof; or (C) wholly within the District of Columbia.

The term “federally protected function” means any function, operation, or action carried out, under the laws of the United States, by any department, agency, or instrumentality of the United States or by an officer or employee thereof; and such term shall specifically include, but not be limited to, the collection and distribution of the United States mails.