Elimination of the hostile element

A book with cold documentary accuracy tells about historical events that have tried to give forgotten for many decades: about mass repressions in the western regions of the USSR, about bloody ethnic purges conducted by Ukrainian and Lithuanian nationalists, about the terrifying crimes of Russian, Ukrainian and Latvian accomplices of Nazism.
How did the Kremlin make decisions on mass deportation operations?
Why did the members of the Baltic SS receive forgiveness from the Soviet regime?
Why did Lavrenty Beria falsified the statistics of Soviet repressions?
When did the Ukrainian nationalists begin the preparation of the Holocaust and the Volyn Republic?
Who burned the Belarusian village of Hatin?
The author had to look for the answers to these and many other questions in the archives of Russia, Belarus, Ukraine and Lithuania