An amendment to the U.S. Constitution that:
- prohibits the federal and state governments from establishing an official religion (called the "Establishment Clause"), and
- freedom to exercise religion (called the "Free Exercise Clause")
- the freedom of speech, which encompasses the rights to speak and listen, to form and maintain a system of beliefs, and to associate with others of like mind
- freedom of the press
- freedom of assembly, and
- freedom to petition the government for a redress of grievances.
The freedoms of speech, press, and assembly are sometimes more generally referred to as the "freedom of expression."
First Amendment (Congressional Research Service)