Kept in solitary confinement in the infamous Lubyanka prison and constantly interrogated, he was given the choice of either cooperating with the NKVD or face charges for alleged war crimes due to the fact, that his regiment had performed Anti partisan duties.
He was imprisoned on an island near Baku, and then transferred to the infamous Cheka prison, Lubianka in Moscow.
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Fluent in over ten languages (including Korean, Chinese, Turkish, and Persian, the last one learned especially in order to read works by Omar Khayyám), Menzhinsky was the second and last member of the Polish nobility among the Lubyanka's chiefs.