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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 word fuck is not against the law to say. It may be hurtful but it's not illegal. People have the right to free speech no matter whether or not it might seem vulgar or offensive to you and I.