What follows is an opinion from a United States Court of Appeals.
Your task is to identify the issue in the case, that is, the social and/or political context of the litigation in which more purely legal issues are argued. Put somewhat differently, this field identifies the nature of the conflict between the litigants. The focus here is on the subject matter of the controversy rather than its legal basis.
Your task is to determine the specific issue in the case within the broad category of "miscellaneous".

Opinion:
NGUYEN DA YEN, Nguyen Da Vuong and Nguyen Da Tuyen, Plaintiffs-Appellants, v. Henry KISSINGER, James Schlesinger, Edward Levy, Colonel Robert V. Kane, Jasper Horn and Mario Obledo, Defendants-Appellees, and Friends For All Children, Friends of Children of Vietnam and Holt Adoption Program, Inc., Defendants in Intervention.
No. 76-1833.
United States Court of Appeals, Ninth Circuit.
July 11, 1979.
Nancy Stearns, New York City, Neil T. Gotanda, Oakland, Cal., argued, for plaintiffs-appellants.
John W. Keker, Kate C. Freeland, San Francisco, Cal., argued, for defendants-appellees.
Before CARTER and HUFSTEDLER, Circuit Judges, and FRANK J. MURRAY, District Judge.
Honorable Frank J. Murray, Senior District designation. Judge, District of Massachusetts, sitting by
ORDER
The district court having refused to certify the class on behalf of which the suit was brought (Nguyen Da Yen v. Kissinger, 70 F.R.D. 656 (N.D.Cal.1975)), and the named plaintiffs having sought and obtained dismissal of their claims, no controversy remains and we are forced to dismiss this appeal for mootness. Vun Cannon v. Breed, 565 F.2d 1096 (9th Cir. 1977). Nothing expressed or implied in this Order is intended to foreclose any parent or child from seeking any remedy to which he or she is entitled, or from raising any of the issues previously raised by appellants herein.

Question: What is the specific issue in the case within the general category of "miscellaneous"?

Choices:
miscellaneous interstate conflict
other federalism issue (only code as issue if opinion explicitly discusses federalism as an important issue - or if opinion explicity discusses conflict of state power vs federal power)
attorneys (disbarment; etc)
selective service or draft issues (which do not include 1st amendment challenges)
challenge to authority of magistrates, special masters, etc.
challenge to authority of bankruptcy judge or referees in bankruptcy
Indian law - criminal verdict challenged due to interpretation of tribal statutes or other indian law
Indian law - commercial disputes based on interpretation of Indian treaties or law (includes disputes over mineral rights)
Indian law - Indian claims acts and disputes over real property (includes Alaska Native Claims Act)
Indian law - federal regulation of Indian land and affairs
Indian law - state/local authority over Indian land and affairs
Indian law - tribal regulation of economic activities (includes tribal taxation)
other Indian law
international law
immigration (except civil rights claims of immigrants and aliens)
other
not ascertained

Answer: 15