a boarding school for the children of revolutionaries

de bene esse: literally, of well-being, morally acceptable but subject to future validation or exception

In 1933 a unique boarding school was set up in Russia to provide a home for the children of revolutionaries around the world.

The children of Mao, Tito and La Pasionaria passed through its doors.

It still exists: http://bbc.in/1capOkP

(Picture courtesy of Interdom)