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. HARDING COLLEGE, Respondent.
No. 11850.
United States Court of Appeals, Sixth Circuit.
Dec. 3, 1953.
A. Norman Somers, Asst. Gen. Counsel, Washington, D. C., John F. Lebus, Regional Director, New Orleans, La., George J. Bott, Gen. Counsel, David P. Findling, Assoc. Gen. Counsel, and Ows-ley Vose and Robert H. Hurt, Attys. for the National Labor Relations Board, Washington, D. C., for petitioner.
Before SIMONS, Chief Judge, and! ALLEN and MILLER, Circuit Judges.
PER CURIAM.
This case came on to be heard upon the record and briefs and oral argument of counsel;
And it appearing that the answer to the complaint herein admitted ownership and operation of WHBQ Radio Station by Harding College;
And it appearing by the uncontradict-ed testimony that respondent Harding College exercises complete control over WHBQ Radio Station;
And it appearing that any objection as to the service of the complaint was. waived by the participation of the respondent Harding College in the proceedings and in its argument to the Board;
And it appearing that the findings of the Board as to the existence of the unfair labor practices charged are supported by substantial evidence on the record considered as a whole;
It is ordered that the order of the Board entered June 26,1952, be 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