The First Amendment of the U.S. Constitution states in part, “Congress shall make no law respecting . . . the right of the people peaceably to assemble, and to petition the Government for a redress of Grievances.” Peaceable protest, even to protest a government or an official thereof, has come to be regarded as a staple of American democracy. In practice, however, the right can be eviscerated such that peaceful protesting is simply not worth the trouble. Such trouble can be orchestrated by a police force or even a government within the United States. Implicit in the right to protest is the value put on tolerating the expression of contrary opinions. Conservative and progressive views, even those of racists and anarchists, respectively, are generally accorded the right to peaceably protest in a public way. If a State is sufficiently one-sided, however, public officials, including governors, majors, and police chiefs, can reflect the dominant attitude of residents that protests on behalf certain political, economic, or social ideologies should not be allowed. If they must be allowed, then massive shows of police force can—it is assumed--legitimately be used to intimidate the protesters.
The full essay is at "The Right of Political Protest."