[meerita]

I have read books, of course. But brain drainage for sure were prior the dissolution. You can read for example about the Operation Osoaviakhim, where 2500 scientists (and their families) were forced to go the soviet union as war reparations. Or the book The Murder of Nikolai Vavilov: The Story of the Persecution of One of the Great Scientists, were you can read how beautiful was science in the soviet union.