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, Petitioner, v. BANGOR SHOE MFG. CO., Inc, Respondent.
No. 5994.
United States Court of Appeals First Circuit.
Oct. 23, 1962.
Warren M. Davison, Washington, D. C, Atty, with whom Stuart Rothman, Gen. Counsel, Dominick L. Manoli, Assoc. General Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Allison W. Brown, Jr, Washington, D. C, Atty, were on brief, for petitioner.
Samuel Leiter, Boston, Mass., with whom Benjamin E. Gordon, Boston, Mass., was on brief, for respondent.
Before WOODBURY, Chief Judge, and HARTIGAN and ALDRICH, Circuit Judges.
PER CURIAM.
Essentially questions of the credibility of witnesses are presented by this petition for enforcement of an order of the National Labor Relations Board adopting findings and conclusions of a trial examiner that the respondent had violated § 8(a) (1) and (3) of the Labor Management Relations Act, 1947, by coercive interrogation and discriminatory discharges of employees. It is true, as the trial examiner noted in his intermediate report, that in this case there is more than the usual contradiction of witnesses for one side by witnesses for the other, that witnesses on the same side sometimes contradicted one another and on occasion even themselves, and also perhaps, to quote the trial examiner: “ * * * more than one witness on one side or the other deliberately gave false testimony.”
But questions of the credibility of witnesses are for the Board, subject to judicial review only when it oversteps the bounds of reason. That is to say, we can set aside the Board’s findings of credibility only when it is evident that it has fallen into a clear mistake. We do not find that situation here.
Giving the trial examiner’s findings the “ * * * weight [that] in reason and in the light of judicial experience they deserve,” Universal Camera Corp. v. N. L. R. B., 340 U.S. 474, 496 (1951), 71 S.Ct. 456, 469, 95 L.Ed. 456, and respecting the Board’s experience and skill, we cannot say that clear error appears in its resolution of questions of credibility. On the contrary, it seems to us that the Board and the trial examiner steered an entirely rational course through unusually confused and conflicting testimony. Substantial evidence in the record considered as a whole supports the Board’s findings and conclusions.
We also agree with the Board’s rejection of the respondent’s contention that the trial examiner was guilty of bias and prejudice.
A decree will be entered enforcing the order of the Board.

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