For anyone interested in a comparison between the evils of the Nazis and the Soviets, I recommend the movie, “The Soviet Story” (2008).
http://www.imdb.com/title/tt1305871/
It is quite graphic in content, much of which is interviews with some of the participants.
That looks interesting, thanks for posting.
On the general subject, see the 3rd quote on my FR profile page, the two-paragraph one by Hayek.