What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 

Your task concerns the first listed appellant. The nature of this litigant falls into the category "federal government (including DC)". Your task is to determine which category of federal government agencies and activities best describes this litigant.

Opinion:
NATIONAL LABOR RELATIONS BOARD v. CONCORDIA ICE CO., Inc.
No. 2856.
Circuit Court of Appeals, Tenth Circuit.
July 3, 1944.
Clarence D. Musser, of Kansas City, Mo. (Alvin J. Rockwell, Gen. Counsel, Howard Lichtenstein, Asst. Gen. Counsel, Roman Beck and Leslie J. Capek, Attys., National Labor Relations Board, all of Washington, D. C., on the brief), for petitioner.
Charles L. Hunt, of Concordia, Kan. (Frank C. Baldwin, of Concordia, Kan., on the brief), for respondent.
Before PPIILLIPS, BRATTON, and HUXMAN, Circuit Judges.
IIUXMAN, Circuit Judge.
This in an application by the National Labor Relations Board for enforcement of its order requiring respondent to cease and desist from violations of Section 8(1) and (5) of the National Labor Relations Act, 29 U.S.C.A. § 151 et seq. The violations charged are that respondent refused to bargain collectively with the Amalgamated Meat Cutters & Butcher Workmen of North America, a labor union which claimed to represent a majority of the respondent’s employees, and that respondent, in violation of the provisions of the Act, interfered with the employees’ rights to organize. The Board made appropriate findings as to the existence of these violations. The jurisdiction of the Board is conceded by respondent. The only question, therefore, in the case is whether the findings of the Board are sustained by substantial evidence.
The legal questions arising out of the passage of this act are well charted and quite generally settled. Not many new or novel questions of law remain to be considered. None are presented here. Where, as here, the jurisdiction of the Board is conceded, the only question remaining for consideration is whether there is substantial evidence supporting its findings. As is generally the case in all such controversies, there is evidence which would support a contrary finding, but as has been so many times pointed out, the resolution of such conflicts is for the Board. A reviewing court may interfere only when the findings are not supported by any substantial evidence.
To set forth the evidence which in our opinion supports the Board’s finding would require an opinion of considerable length. To recite the events in detail would add nothing of value to the legal publications, nor to cases which will arise in the future, because the facts in each case are generally entirely separate and dissimilar to those in other cases. Under these circumstances, we feel that we are not justified in unnecessarily encumbering legal publications with a detailed statement of the evidence.
We deem it sufficient to say that we have carefully examined the entire record in this case and conclude that the findings of the Board are sustained by substantial evidence, and its order will therefore be enforced.

Question: This question concerns the first listed appellant. The nature of this litigant falls into the category "federal government (including DC)". Which category of federal government agencies and activities best describes this litigant?

Choices:
cabinet level department
courts or legislative
agency whose first word is "federal"
other agency, beginning with "A" thru "E"
other agency, beginning with "F" thru "N"
other agency, beginning with "O" thru "R"
other agency, beginning with "S" thru "Z"
Distric of Columbia
other, not listed, not able to classify

Answer: 4