The First Amendment to the United States Constitution protects the right to freedom of assembly, which includes the right to gather for political purposes.

The clear and present danger doctrine allows the government to restrict speech that is considered to be a clear and present danger to national security or public safety.

The Supreme Court case Prigg v. Pennsylvania established the right of political parties to nominate candidates for public office.

The legal principle that allows the government to regulate campaign finance is strict scrutiny, which requires the government to show that the regulation is necessary to achieve a compelling government interest and that it is narrowly tailored to achieve that interest.

The Supreme Court case Buckley v. Valeo upheld the constitutionality of campaign finance limits.

The legal doctrine that allows the government to ban certain types of speech, such as obscenity, child pornography, and fighting words, is obscenity.

The Supreme Court case Tinker v. Des Moines Independent Community School District established the right of individuals to engage in symbolic speech.

The legal principle that allows the government to regulate the time, place, and manner of speech is rational basis review, which requires the government to show that the regulation is rationally related to a legitimate government interest.

The Supreme Court case Texas v. Johnson upheld the constitutionality of a law that prohibited the burning of the American flag.

The legal doctrine that allows the government to ban speech that is considered to be a threat to national security is clear and present danger.

The Supreme Court case Tinker v. Des Moines Independent Community School District established the right of individuals to engage in political speech.

The legal principle that allows the government to regulate the content of speech is strict scrutiny, which requires the government to show that the regulation is necessary to achieve a compelling government interest and that it is narrowly tailored to achieve that interest.

The Supreme Court case City of Cincinnati v. Discovery Network, Inc. upheld the constitutionality of a law that prohibited the distribution of leaflets in a public park.

The legal doctrine that allows the government to ban speech that is considered to be a threat to public safety is fighting words.

The Supreme Court case Tinker v. Des Moines Independent Community School District established the right of individuals to engage in expressive conduct.