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:
RAILWAY LABOR EXECUTIVES ASSOCIATION, Petitioner, v. INTERSTATE COMMERCE COMMISSION and United States of America, Respondents, Missouri-Kansas-Texas Railroad Co., et al., Intervenors.
No. 88-1391.
United States Court of Appeals, District of Columbia Circuit.
April 11, 1991.
Before WALD and BUCKLEY, Circuit Judges, and ROBINSON, Senior Circuit Judge.
Senior Circuit Judge ROBINSON did not partic-ípate in this matter.
ORDER
PER CURIAM.
On consideration of intervenors’ petition for rehearing filed October 12,1989, and of the supplemental memorandum in support thereof filed March 27, 1991, it is
ORDERED by the court that inter-venors’ petition for rehearing be denied. Intervenors’ suggestion that the court’s opinion of August 29, 1989 (883 F.2d 1079) be modified in light of the Supreme Court's recent decision in Norfolk & Western Ry. v. American Train Dispatchers Ass’n, — U.S. —, 111 S.Ct. 1156, 113 L.Ed.2d 95 (1991), is granted as follows:
At 883 F.2d at 1082, delete the second full paragraph beginning “Our recent decision in Brotherhood of Railway Carmen....”, as well as the introductory phrase of the third paragraph, “Although that issue is squarely presented here, we find it inappropriate to consider the question because”. Insert the following introductory phrase at the beginning of the third paragraph: “We find, however, that”.

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: 8