The distinction matters because government often regulates acts that combine expression with physical effects. A parade uses streets, a demonstration creates sound, and burning an object creates fire. Recognizing expression begins the First Amendment inquiry; it does not automatically invalidate every neutral safety or conduct rule.

The government's reason selects the test. If officials object to the idea conveyed, the law is content based. In Texas v. Johnson, punishment of flag burning could not rest on preserving the flag as a symbol of national unity or on listeners' offense. Those interests were connected to the message. A law banning only flag treatment that communicates contempt similarly defines the offense through expression.

When a law regulates the nonspeech element for a reason unrelated to suppressing expression, the intermediate framework associated with United States v. O'Brien may apply. The regulation must be within governmental power, further an important or substantial interest, rest on an interest unrelated to suppressing expression, and burden expression no more than essential to that interest. A general prohibition on open fires during extreme drought can address physical danger even when applied to a ceremonial protest fire.

Compelled symbolic expression presents the opposite problem. Government ordinarily may not force a person to salute a flag, display an ideological motto, or affirm an official belief. The injury is not silence but compelled adoption or presentation of a message. A neutral requirement to display factual safety information may involve a different doctrine because the government's reason and the character of the required message differ.

Forum rules can operate at the same time. A political march is expressive conduct, yet a city may coordinate routes through a valid content-neutral time, place, and manner system. The permit cannot depend on whether officials admire the marchers' cause or expect opponents to react badly.

Compare two ordinances. One prohibits burning any object in a crowded plaza because sparks have injured pedestrians. The other prohibits burning the national flag when the act expresses criticism of government. Both govern conduct, but the first addresses an independent physical harm while the second targets a message. The correct path is government action, communicative conduct, forum, regulatory reason, and the resulting test.

Do not use emotional reaction as the rule. A symbol may be revered, and its treatment may deeply offend observers, but offense alone neither removes expression from the First Amendment nor proves imminent violence, obscenity, or any other recognized category.

Video lesson: Freedom of Speech: Crash Course Government and Politics #25