Many groups and individuals liked Marx's ideas. By the beginning of the twentieth century, there was a worldwide socialist movement called Social Democracy. It was influenced by his ideas. They said that the workers in different countries had more in common with each other than the workers had in common with the bosses within their own countries. In 1917, Vladimir Lenin and Leon Trotsky led a Russian group called the Bolsheviks in the October Revolution. They got rid of the temporary government of Russia, which was formed after the February Revolution against the Tsar (Emperor). They established the Union of Soviet Socialist Republics, also called the Soviet Union or USSR.