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 respondent. The nature of this litigant falls into the category "federal government (including DC)", specifically "other agency, beginning with "F" thru "N"". Your task is to determine which specific federal government agency best describes this litigant.

Opinion:
Kurt Karl Friedrich HEGERICH, Appellant, v. Albert DEL GUERCIO, District Director, Immigration and Naturalization Service, Los Angeles, California, Appellee.
No. 15577.
United States Court of Appeals Ninth Circuit.
May 12, 1958.
Harry Wolpin, Los Angeles, Cal., for appellant.
Laughlin E. Waters, U. S. Atty., Richard A. Lavine, Burton C. Jacobson, Asst. U. S. Attys., Los Angeles, Cal., for ap-pellee.
Before CHAMBERS and BARNES, Circuit Judges, and CHASE A. CLARK, District Judge.
PER CURIAM.
Hegerich is a national and citizen of Germany. He was properly admitted at New York City on February 18, 1956. His permit authorized him to stay until May 20, 1956. With his passport was a visa from the United States consul in Munich, Germany, reciting that he had until May, 1957, to apply for permanent admission to the United States.
On May 23, 1956, he went for the second time to the immigration and naturalization office in Los Angeles to clear up his status, to seek extension of the time of his stay. The office’s reply to his request was to arrest him on the spot. Subsequently, administrative proceedings were held to determine his deportability and to consider his application for voluntary departure. The result was an order directing his deportation and denying his application for voluntary departure.
The administrative proceedings were upheld on review by the district court. This appeal followed.
As to deportability, the facts would seem to positively support the administrative conclusion. However, as tc the ruling on voluntary departure which would affect Hegerich’s right to apply for readmission, this court is of the opinion that there was an abuse of discretion. No suggestion is made that appellant is not a person of good moral character. His overstaying was de minimis in time. Blunderingly, he was trying to comply with the law. It is clear that his conduct was neither slick nor foxy. In this field of voluntary departure, ordinarily action unfavorable to the deportee must be upheld. But the government, as it should, seems to concede that there can be a case where the denial of voluntary departure can be an abuse of administrative discretion. This court holds that this is it.
Reversed for proceedings which will permit appellant’s voluntary departure.

Question: This question concerns the first listed respondent. The nature of this litigant falls into the category "federal government (including DC)", specifically "other agency, beginning with "F" thru "N"". Which specific federal government agency best describes this litigant?

Choices:
Food & Drug Administration
General Services Administration
Government Accounting Office (GAO)
Health Care Financing Administration
Immigration & Naturalization Service (includes border patrol)
Internal Revenue Service (IRS)
Interstate Commerce Commission
Merit Systems Protection Board
National Credit Union Association
National Labor Relations Board
Nuclear Regulatory Commission

Answer: 4