Dear Student,
The Tsarist autocracy in Russia fell in 1917 given the wide dissatisfaction and mistrust in the Tsar. Before that, food shortages were a spike in Russia and Tsar's wish to dissolve the Duma was like oil in the fire. Widespread protests and strikes followed in Petrograd. Common people marched towards the palace of Tsar and in a turn of events, the soldiers refused to fire on them. They in fact joined the protestors and became one soviet called the Petrograd Soviet. This is called the February Revolution that led to the abdication of the throne by Tsar on 2nd March.
In October, a conflict broke out between the Bolsheviks and the Provincial Government. The previous month, Lenin had gathered supporters for an uprising. He convinced the Petrograd Soviet and the Bolshevik party to seize power. Leon Trotsky was set as the head of a Military Revolutionary Committee to seize power. When the uprising started, Kerenskii, the Prime Minister tried to bring in more troops to control the situation. However, the Bolsheviks attacked the palace and government offices and established control over the city by nightfall. This gave way to the Soviet being ruled by Lenin with Bolsheviks under his guidance.
After this, socialism began in Russia - the banks and industries were nationalised, old aristocratic titles were banned, the land was declared common property, residents were re-allocated according to family size. Socialism in Russia was forced from above as the Bolsheviks gradually became powerful and Russia became a one-party-state.
Regards