When did the Socio-political movement in Russia Occur in the 19Th century?

The socio-political climate in Russia began to change during the latter half of the 19th century. Russia was, at the time, effectively, an absolute monarchy. Resentment by the general populace grew until revolution became inevitable which happened at the beginning of the 20th century. It became know as the October Revolution and occurred in 1917. At which time the Bolsheviks (Communist) party overthrew the Tzar and became the ruling party.