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Regulations are not law (they do not come through the Congress), but they have the force of law.
Federal agencies are authorized to promulgate regulations by publishing them in the Federal Register. Eventually, after a period for public comment and revisions based on comments received, a final version is published in the Federal Register and the regulations are incorporated into the Code of Federal Regulations, known as CFR.
Published by the Office of the Federal Register, National Archives and Records Administration (NARA), the Federal Register is the official daily publication for rules, proposed rules, and notices of Federal agencies and organizations, as well as executive orders and other presidential documents.
The codification of the general and permanent rules and regulations (administrative law) published in the Federal Register by the executive departments and agencies of the Federal Government of the United States.