Amendment I (the First Amendment) of the United States Constitution is part of the United States Bill of Rights. It states:
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.

Thus, it prevents the United States Congress from passing any law which:

The consequences of this Amendment to American society have been profound. First Amendment questions have been raised with regard to the separation of church and state; civil rights issues; pornography and obscenity; political speech and organizations; journalism and its restrictions; involuntary commitment laws; and many more.

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United States Bill of Rights
United States Constitution
2nd Amendment