In two or three sentences, summarize Stalin's paranoia and the actions that came about as a result.

Joseph Stalin was born Josef Vissarionovich Djugashvili on December 18, 1878, or December 6, 1878, according to the Old Style Julian calendar (although he later invented a new birth date for himself: December 21, 1879), in the small town of Gori, Georgia, then part of the Russian empire. When he was in his 30s, he took the name Stalin, from the Russian for "man of steel."