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 Establishment Clause
Free Exercise Clause
Schenk v. United States (1919)
New York Times v. Sullivan (1964)
Redress of Grievances