It is well-worth reading the Stalin biographies by Montefiore:
http://]http://www.amazon.com/Stalin-The-Court-Red-Tsar/dp/1400076781/ref=sr_1_3?ie=UTF8&qid=1346348604&sr=8-3
http://www.amazon.com/Young-Stalin-Vintage-Simon-Montefiore/dp/1400096138/ref=sr_1_4?ie=UTF8&qid=1346348604&sr=8-4
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