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:
MELLEN v. HIRSCH et al.
No. 5788.
United States Court of Appeals Fourth Circuit.
Dec. 3, 1948.
Joseph H. Mellen, pro se.
Paul F. Due, of Baltimore, Md. (Due, Nickerson & Whiteford, of Baltimore, Md., on the brief) for appellees.
Before PARKER, Chief Judge, and SOPER and DOBIE, Circuit Judges.
PER CURIAM.
This is an appeal from a judgment for defendant in a personal injury action, in which the lower court held that an exclusive remedy was provided by the Longshoremen’s and Harbor Workers’ Compensation Act, 33 U.S.C.A. § 901 et seq., applicable in the District of Columbia as a Workmen’s Compensation Act, D.C.Code 1940 secs. 36 — 501, 36 — 502, 45 Stat. 600, c. 612, 33 U.S.C.A. § 901 note. Appellant, in a prior action in the District of Columbia, had contended that the act did not apply to him because he was employed in violation of the child labor law, but this contention was decided against him. Mellen v. H. B. Hirsch & Sons, D.C.Cir., 159 F.2d 461. In the court below, his position was that the act was not applicable because the employer had not obtained insurance covering his injury as required by the act; but the evidence was clearly contrary to this contention, as pointed out in the opinion and supplemental memorandum filed by the judge below. Nothing need be added to these; and the case will be affirmed on the basis of what is there so well said.
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: 14