How did Russians treat the serfs?

Serfdom was the basis of the Russian economy for hundreds of years. Many unsuccessful attempts were made to change things for the Serfs. The one successful event was Russian revolution in 1917. They overthrew the Tsar, introduced Communism and established the Union of Soviet Socialist Republics where all businesses were state owned and operated. It was subsequently argued that they became Serfs of the State rather than to the nobles.