Analysis of information sources in references of the Wikipedia article "سرجئیف پاساد" in Urdu language version.
Lenin's successor Stalin intensified religious persecution in the Soviet Union overall, and the situation perhaps became threatening enough to warrant the town to change its name in 1930 to Zagorsk, derived from the name of the Bolshevik revolutionary Vladimir Zagorsky, who was assassinated by rival socialists in 1919.