Vladimir Ilyich Lenin (1870-1924) was a Russian communist revolutionary, politician, and head of the Soviet Union from 1917 until his death in 1924. He was a key figure in the Bolshevik Party and led the October Revolution, which overthrew the Provisional Government and established Soviet power in Russia. Lenin's ideas and leadership were instrumental in the establishment of a socialist state in Russia, which became the world's first socialist republic. Lenin's writings, including his famous work "The State and Revolution," have had a profound influence on Marxist theory and communist movements worldwide.