First Amendment of the Bill of Rights
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances
The First Amendment of the United States Constitution protects the right to freedom of religion and freedom of expression from government interference. See U.S. Constitution Bill of Rights, Amendment I
Freedom of expression consists of the rights to freedom of speech, press, and assembly and to petition the government for a redress of grievances, and the implied rights of association and belief. The Supreme Court interprets the extent of the protection afforded to these rights. The Court as applying to the entire federal government even though it is only expressly applicable to Congress has interpreted the First Amendment. Furthermore, the Court has interpreted, the due process clause of the Fourteenth Amendment as protecting the rights in the First Amendment from interference by state governments. See U.S. Constitution Bill of Rights, Amendment XIV.