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:
GAMBLE ENTERPRISES, Inc., Petitioner, v. NATIONAL LABOR RELATIONS BOARD, Respondent.
No. 11405.
United States Court of Appeals Sixth Circuit.
April 10, 1953.
Supplemental Order April 21, 1953.
Jones, Day, Cockley & Reavis, Cleveland, Ohio, for petitioner.
Geo. J. Bott, A. Norman Somers, Washington, D. C., for respondent.
Herschcl Kriger, Canton, Ohio, and Henry Kaiser, Washington, D. C., for in-tervenor.
PER CURIAM.
In pursuance of a Mandate from the Supreme Court of the United States, after the announcement of its decision, 345 U.S. 117, 73 S.Ct. 560, reversing our judgment of May 9, 1952, 196 F.2d 61,
It is now ordered that our judgment and order are set aside and held for naught and the cause is remanded to the National Labor Relations Board for further proceedings not inconsistent with the opinion and mandate of the Supreme Court.
Supplemental Order
PER CURIAM.
Our order of April 10, 1953 remanding the cause to the National Labor Relations Board for further proceedings, 202 F,2d 954, is set aside and the following order is to be entered.
In pursuance of a mandate from the Supreme Court of the United States, after the announcement of its decision reversing our judgment of May 9, 1952, 196 F.2d 61, it is now ordered and adjudged that our judgment entered in the said cause on the 9th day of May, 1952, is in conformity with the opinion of the Supreme Court of the United States, 345 U.S. 117, 73 S.Ct. 560, and its mandate therein is
Reversed and the petition to set aside the order of the National Labor Relations Board dismissing the complaint against Local No. 24 American Federation of Musicians is denied and the said order, is affirmed.

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