I’m currently reading a biography of Kurt Gödel¹ and the first 60 pages are about Austria’s authoritarian-driven brain drain almost 100 years ago.
¹ https://www.amazon.com/Journey-Edge-Reason-Life-G%C3%B6del/d...
¹ https://www.amazon.com/Journey-Edge-Reason-Life-G%C3%B6del/d...
Amazingly he still passed.