So-called "serfdom" was abolished in Russia in 1861. In 1861 the number of serfs was about 35% of population.
Communist "October revolution" of 1917 didn't topple Russian monarchy. Actually, tsar was forced to abdicate during "February revolution" in 1917, when Russia became parliamentary democracy. Since February to October Russia literally was the most politically free state on Earth. It was the first country in the world to provide equal voting rights to everybody, including all sexes without distinction by wealth or any categories.
Under the veil of free speech it also gave ground to scammers of all sorts, like Bolsheviks, who with the help of Germany overthrew the government and proclaimed "dictatorship of proletariat".
Serfdom wasn't allowed in most of "national" parts of the Russian Empire. In Baltics it was abolished long before "metropolis" in 1804. In Finland after it was attached to Russia after Napoleonic wars it was never implemented. All the national regions enjoyed greater economic and political rights to stimulate their seamless integration and promote their advantages.