Who led the effort to establish communism in the 1920s?

The effort to establish communism in the 1920s was primarily led by Vladimir Lenin and the Bolshevik Party in Russia. Following the Russian Revolution of 1917, Lenin implemented Marxist principles to create a socialist state, which later became the Soviet Union. His leadership and policies, including the New Economic Policy (NEP), aimed to stabilize the economy while consolidating communist power. Additionally, the Comintern was established to promote global communist movements during this period.