Enter a clue or pattern or both:
The Clue
Concern of Soviet officials (10 letter answer)
The Answer
EMIGRATION
Tags
Notes
The answer EMIGRATION is so rare that it appears less than once every 2500 puzzles.
Definition
EMIGRATION as a noun:
1. (emigration, out-migration, expatriation) = migration from a place (especially migration from your native country in order to settle in another)