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:
GALIS ELECTRIC & MACHINE CO., Petitioner, v. NATIONAL LABOR RELATIONS BOARD, Respondent.
No. 9029.
United States Court of Appeals Fourth Circuit.
Argued Oct. 2, 1963.
Decided Oct. 4, 1963.
Charles Haden and Charles Haden, II, Morgantown, W. Va. (Haden & Haden and Michael Tomasky, Morgantown, W. Va., on the brief), for petitioner.
James McConnell Harkless, Atty., N. L. R. B. (Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Solomon I. Hirsh, Atty., N. L. R. B., on the brief), for respondent.
Before HAYNSWORTH, BRYAN and BELL, Circuit Judges.
PER CURIAM.
Review and enforcement of an order of the National Labor Relations Board is sought by these cross-petitions. The Board had found that the employer had violated § 8(a) (3) of the Act by the discharge of six employees and that, by other conduct, it violated § 8(a) (1) of the Act. After full consideration of the record, the briefs, and the argument of counsel, it appears that the Board’s findings of fact are supported by substantial evidence on the record considered as a whole. Accordingly, the Board’s order will be enforced.
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