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I have some background in history, though mostly this is from my own study.
There are some big ones on Nazi Germany in particular. William L Shirer's "The Rise and Fall of the Third Reich" is an obvious choice. Worth bearing in mind that his background was journalism and his thesis of Sonderweg (the idea that German history very specifically had an authoritarian tendency that inevitably prefigured the Nazis) is not considered convincing by most of the great historians.
Anything by Richard J Evans is highly recommended, particuarly his trilogy on the Third Reich. He also regularly appears on many documentaries on the Nazis.
As regards to Russia you would have to ask someone else. Serhii Plokhy is well regarded though he mostly focuses on Ukraine and the Soviet period.
If it’s worth saying, but not worth its own post, here's a place to put it.
If you are new to LessWrong, here's the place to introduce yourself. Personal stories, anecdotes, or just general comments on how you found us and what you hope to get from the site and community are invited. This is also the place to discuss feature requests and other ideas you have for the site, if you don't want to write a full top-level post.
If you're new to the community, you can start reading the Highlights from the Sequences, a collection of posts about the core ideas of LessWrong.
If you want to explore the community more, I recommend reading the Library, checking recent Curated posts, seeing if there are any meetups in your area, and checking out the Getting Started section of the LessWrong FAQ. If you want to orient to the content on the site, you can also check out the Concepts section.
The Open Thread tag is here. The Open Thread sequence is here.