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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.
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The US Constitution enumerates specific powers granted to the Federal Government, and generally limits its powers. It does not restrict the rights of individuals or of associations thereof (generally both are free to trade, or not, with others). It's a flawed document, intended to be a practical implementation of the limited-government ideals espoused in the Declaration of Independence: that the sole proper purpose of government is to secure our individual rights.