Bukharin's Last Plea
- Transcript of Nicolai Bukharin's final plea during his trial for treason before the Supreme Court of the U.S.S.R., Moscow, March 12, Evening session, 1938.
- http://art-bin.com/art/obukharin.html

The Kirov Murder
- It was the spark for the great purges of the 1930's. The Kirov murder was a pivotal event in Soviet History. Includes a short biography of Kirov, a description of the murder, and analysis.
- http://www.indepthinfo.com/kirov/index.shtml

References: good articles to read about Stalin and the Purges
- Bibliographic material from Challenge-Desafio.
- http://www.plp.org/books/biblio.html

Modern History Sourcebook: Stalin's Purges, 1935
- Text for introductory level classes.
- http://www.fordham.edu/halsall/mod/1936purges.html