Federal Reserve notes are.
Federal Reserve Notes are legal paper money in circulation in the United States. The original legal issue was not called dollars, but Federal Reserve notes, also known as gold notes, gold notes.
Federal Reserve Notes are the legal currency of the United States under the Federal Reserve Act.
The Federal Reserve Board controls and manages the issuance and withdrawal of Federal Reserve notes.
Entrusted by the Federal Reserve Board, the U.S. Treasury Department and its subordinate Office of the Comptroller of the Currency are responsible for the printing and destruction of Federal Reserve notes and other technical work.