How did Lenin influence the seizure of power of the Russian tsar?

Vladimir Lenin was instrumental in the demise of the tsar and his family. Because of the poor economic conditions that existed in Russia in the early 20th Century, many Russian peasants were very unsatisfied.  Lenin, an avowed Marxist, believed that the workers should rise up and take control of the government.  Since 1889, Lenin was one of the greatest proponents of Marxism in Russia.  Lenin was a very intellectual and talented man having earned his law degree in 1892.  His writings were thoughtful and influential and moved the labor movement to action.  His work motivated a passionate group of workers to lead a revolt against the Tsar in February of 1917.  When the tsar was replaced by the Provisional Government, Lenin was unsatisfied.  Lenin returned to St. Petersburg from exile in October and toppled the provisional government.  A bloody civil war ensued during which Lenin's troops assassinated the royal family.  Lenin was able to gain a Bolshevik victory in the civil war and was the first leader of communist Russia.