Different between October and February revolution in small point
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Russia still used the Julian calendar, the "February" and "October" revolutions actually happened in March 1917 and November 1917 respectively. For convenience I will stick to dates on the Julian Calendar.
The February 1917 revolution produced a democratic, republican government, with a, defacto, separation of powers between the Duma (Russia's elected parliament created after the revolution of 1905) and the Soviets, workers councils also formed during 1905 and later, which until 1917 had no real political power.
The October revolution produced the communist dictatorship the USSR laboured under for another 70 years. Lenin's government, as promised, transferred "all power to the soviets" and made them supreme abiters of decision making (though of course he would claim a lot of power for himself under a "dictatorship of the proletariat"). Lenin's government shut down the Russian Constiuent Assembly after it had met for only a few hours, ending any hopes of parliamentary democracy in Russia for another 70 years. Lenin also implemented War Communism and started the Cheka, a secret police who killed at least 12,000 people between 1917 and 1922.