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:
GENERAL COMMUNICATIONS SERVICE, INC., Petitioner, v. NATIONAL LABOR RELATIONS BOARD, Respondent.
No. 73-1434.
United States Court of Appeals, Ninth Circuit.
Dec. 27, 1973.
Max C. Richards (argued), Bilby, Thompson, Shoenhair & Warnoek, Tucson, Ariz., for petitioner.
Elliott Moore, Asst. Gen. Counsel, W. L. Corbett (argued), National Labor Relations Board, Washington, D. C., Peter G. Nash, Gen. Counsel, and John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Assoc. Gen. Counsel, of NLRB, Washington, D. C., James W. Mast, NLRB, Albuquerque, N. M., for respondent.
Bruce Thoren, Arizona Director of Communications Workers of America, Phoenix, Ariz., for charging party.
Before ELY and' SNEED, Circuit Judges, and SOLOMON, District Judge.
Hon. Gus J. Solomon, Senior United States District Judge, Portland, Oregon, sitting by designation.
OPINION
PER CURIAM:
The Board’s Decision and Order is reported at 201 N.L.R.B. No. 135.
Our review of the record convinces us that the reasoning of the Board’s Decision was correct. Accordingly, and upon the basis of the Board’s reasoning, the Petition to Review is denied, the respondent Board’s Cross-Application is granted, and the Board’s Order will be
Enfoi’ced.

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