reeducation camp

noun2

1. •
   (euphemistic) A camp or prison where ideological dissidents undergo reeducation or indoctrination.
2. •
   (old-fashioned) A camp where people are rehabilitated to health, especially after injury.

   • By degrees the seriously wounded were concentrated in this hospital, which remained open till 1919, and the discharged drafted to a Belgian reeducation camp in France. — 1922