[Penguin]

Originally Posted by kraznyi_oktjabr

Slightly off-topic but where letters "KZ" come from? I assume it means concentration camp but that abbreviation is not familiar to me.

The term used during the 3rd Reich was KL - the abbreviation for Konzentrationslager. KZ was used later, afaik only because this sounds more sharp in German, so this is also political, to make the word sound more evil.
Personally, I use KL when I discuss with people who are historical interested.
Don't know when the use of KZ started, the literature after the war used KL - like Kogen's standard work that I recommended in my previous post, which is from 1947.