Aleksandr Konstantinovich Voronsky (Russian: Алекса́ндр Константи́нович Воро́нский) (8 September 1884 [O.S. 27 August] – 13 August 1937) was a prominent humanist Marxist critic and editor of the 1920s, disfavored and purged in 1937 for his work with the Left Opposition and Leon Trotsky during and after the October Revolution. Voronsky's writings were hidden away in the Soviet Union, until his autobiography, Waters of Life and Death, and anthology, Art as the Cognition of Life were translated and published in English.
Voronsky was born in the village of Khoroshavka in Tambov Governorate; his father was the village priest, Konstantin Osipovich Voronsky, who died when Aleksandr was a few years old. After attending a Tambov religious school, in 1900 he enrolled in the Tambov Seminary, where he helped organize an illegal library for the seminary students. In 1904 he joined the Bolshevik faction of the Russian Social Democratic Labor Party, and the following year he was expelled from the seminary for "political unreliability". He moved to St. Petersburg, where he carried out party assignments and met Vladimir Lenin; in September 1906 he was arrested and sentenced to a year of solitary confinement. Soon after his release he was arrested again in Vladimir and sentenced to two years of exile; on his way to Yarensk in Vologda guberniya he met his future wife, Serafima Solomonovna Pesina, another young Bolshevik. After finishing his exile in 1910 he moved to Moscow and then Saratov, where he helped form a provincial group of Bolsheviks and organize a number of major strikes. In January 1912 he was one of 18 delegates to the Prague Party Conference, at which he took the minutes of the conference and spoke strongly for a mass daily workers' newspaper. On his return to Russia he continued underground work and was rearrested on May 8; his exile ended in September 1914, when he returned to Tambov with his wife and newborn daughter, Galina, moving to Ekaterinoslav the following year.