At the beginning of the twentieth century, the Jadidist movement of educated Central Asians, centered in present-day Uzbekistan, began to advocate overthrowing Russian rule. In 1916 violent opposition broke out in Uzbekistan and elsewhere, in response to the conscription of Central Asians into the Russian army fighting World War I. When the tsar was overthrown in 1917, Jadidists established a short-lived autonomous state at Quqon. After the Bolshevik Party gained power in Moscow, the Jadidists split between supporters of Russian communism and supporters of a widespread uprising that became known as the Basmachi Rebellion. As that revolt was being crushed in the early 1920s, local communist leaders such as Faizulla Khojayev gained power in Uzbekistan. In 1924 the Soviet Union established the Uzbek Soviet Socialist Republic, which included present-day Tajikistan and Uzbekistan. Tajikistan became the separate Tajik Soviet Socialist Republic in 1929. In the late 1920s and early 1930s, large-scale agricultural collectivization resulted in widespread famine in Central Asia. In the late 1930s, Khojayev and the entire leadership of the Uzbek Republic were purged and executed by Soviet leader Joseph V. Stalin (in power 1927–53) and replaced by Russian officials. The Russification of political and economic life in Uzbekistan that began in the 1930s continued through the 1970s. During World War II, Stalin exiled entire national groups from the Caucasus and the Crimea to Uzbekistan to prevent "subversive" activity against the war effort.