The latest installment of Ruben Bolling's political cartoon "Tom the Dancing Bug" takes the form of a satirical information sheet, "So… You've Been Indefinitely Detained!" Among the "Frequently Asked Questions, Which You'll Have Plenty of Time to Contemplate," is this one:
Q. Have I been disappeared?
A. People aren't "disappeared" in America! Only in lawless dictatorships can intransitive verbs be used to make passive forms.
The Oxford English Dictionary (2nd ed.) records transitive disappear from 1897:
3. trans. To cause to disappear.
1897 Chem. News 19 Mar. 143 We progressively disappear the faces of the dodecahedron.
1949 Amer. Speech 24 41 The magician may speak of disappearing or vanishing a card.
But the relevant use appears in draft additions to the entry, added in December 2002:
a. intr. Of a person: to go missing in suspicious circumstances; spec. (euphem.) to undergo abduction or arrest, esp. for political reasons, and subsequently to be detained or killed, without one's fate being made known.
1941 W. Williams Riddle of Reich iv. 36 There have been arrests recently and there are rumors that some people have disappeared, people who told about the destruction which the British have inflicted on northwestern and western Germany.
1969 C. Belfrage tr. E. Galeano Guatemala 68 There are never any witnesses of a killing.‥ The families of many who disappear prefer not to take the matter to the authorities.
1977 Washington Post (Nexis) 10 Mar. a2 Yesterday's petition, which had more than 2,000 signatures, asked the court to‥work to clear up the fate of 501 persons listed as having disappeared in the past 3½ years after being arrested by security police.
1985 London Mag. Oct. 22 The other journalist, a friend of mine, ‘disappeared’ at the end of 1976 and is presumed murdered by the military who seized government in March that year.
1999 S. L. Kasfir Contemp. Afr. Art v. 151 As more and more Ugandans including the University's own vice chancellor ‘disappeared’ into Makindye or Luzira prison never to be seen again.
b. trans. euphem. To abduct or arrest (a person), esp. for political reasons, and subsequently to kill or detain as a prisoner, without making his or her fate known. Freq. with reference to Latin America. [Originally and chiefly after American Spanish desaparecido desaparecido n.]
1979 N.Y. Times Mag. 21 Oct. 66 While Miss Iglesias ‘was disappeared’, her family's writ of habeus corpus, filed on her behalf, was rejected by the courts.
1987 E. Leonard Bandits iii. 37 Our two Nicaraguan doctors were disappeared, one right after the other.
1990 Times 8 Aug. 17/1 Armed men arrive in a village and ‘disappear’ any activists, several of whom have later been found floating in nearby rivers.
1999 Guardian 28 Sept. i. 2 By refusing to tell the families of the 1,198 people who were forcibly disappeared by the Chilean security forces what had happened to their loved ones they were subjecting them to ‘mental pain, suffering and demoralization’.
For more on similar verbs in Mandarin, see Victor Mair's post, "Suicided: the adversative passive as a form of active resistance" (with discussion in the comments about disappear).
(Hat tip, Ed Cormany.)