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, and International Union, United Automobile Aerospace and Agricultural Implement Workers of America (U.A.W.), AFL-CIO, Intervenor, v. GENERAL AUTOMATION MFG., INC., Respondent.
No. 18696.
United States Court of Appeals Sixth Circuit.
April 18, 1969.
Ronald Wm. Egnor, N.L.R.B., Washington, D. C., Arnold Ordman, General Counsel, Dominick L. Manoli, Associate General Counsel, Marcel Mallet-Prevost, Asst. General Counsel, Paul J. Spielberg, Attys., N.L.R.B., Washington, D. C., on brief, for petitioner.
Edward J. Simerka, Cleveland, Ohio, V. Jay Einhart, Carl H. Clark, Stanley, Smoyer & Schwartz, Cleveland, Ohio, George B. Wells, Detroit, Mich., on brief, for respondent.
Jordan Rossen, Detroit, Mich., Stephen I. Sehlossberg, John A. Fillion, Bernard F. Ashe, Stanley Lubin, Detroit, Mich., on brief, for intervenor.
Before CELEBREZZE and PECK, Circuit Judges, and GORDON, District Judge.
Honorable James F. Gordon, United States District Judge for the Western District of Kentucky, sitting by designation.
ORDER.
This cause came on to be heard upon the record on appeal and the briefs and arguments of counsel, and upon due consideration thereof and of the factual situation as set out in the record and the report of the case, 167 N.L.R.B. No. 66, it appears to the Court that the findings and order of the Board are supported by substantial evidence on the record as a whole.
Now, therefore, it is ordered that the order of the Board be, and it is, hereby enforced.

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