What follows is an opinion from a United States Court of Appeals. Your task is to identify the federal agency (if any) whose decision was reviewed by the court of appeals. If there was no prior agency action, choose "not applicable".

Opinion:
NATIONAL LABOR RELATIONS BOARD, Petitioner, v. ARMOUR & COMPANY, Respondent.
No. 3353.
Circuit Court of Appeals, Tenth Circuit.
June 30, 1947.
Mozart G. Ratner, of Washington, D. C. (Gerhard P. Van Arkel, Gen. Counsel, Morris P. Glushien, Associate Gen. Counsel, A. Norman Somers, Asst Gen. Counsel, Joseph B. Robison, and Arnold Ordman, all of Washington, D. G, on the brief), for Petitioner.
Kenaz Huffman, of Denver, Colo. (Frederick R. Baird, Ray F. Feagans, and Paul E. Blanchard, all of Chicago, 111., and Huffman, Sutliff & Rogers, of Denver, Colo., on the brief), for respondent.
Before BRATTON, HUXMAN, and MURRAH, Circuit Judges.
PER CURIAM.
On the authority of National Labor Relations Board v. Jones & Laughlin Steel Corp., 67 S.Ct. 1274, and National Labor Relations Board v. E. C. Atkins & Co., 67 S.Ct. 1265, an order of enforcement will be entered herein.

Question: What federal agency's decision was reviewed by the court of appeals?

Choices:
Benefits Review Board
Civil Aeronautics Board
Civil Service Commission
Federal Communications Commission
Federal Energy Regulatory Commission
Federal Power Commission
Federal Maritime Commission
Federal Trade Commission
Interstate Commerce Commission
National Labor Relations Board
Atomic Energy Commission
Nuclear Regulatory Commission
Securities & Exchange Commission
Other federal agency
Not ascertained or not applicable

Answer: 9