At the height of the Great Purge, Stalin ordered Svanidze’s arrest in 1937. Svanidze refused to confess to being a German spy in return, as the NKVD offered him, for his life. "Such aristocratic pride," Stalin is quoted to have said. Svanidze and his sister Mariko were executed in 1941, as the Germans advanced. His wife Maria (née Korona; 1889–1941), a singer for the Tbilisi Opera House, was sentenced to ten years in Dolinskoye, a women's prison camp in Kazakhstan. She died of a heart attack upon being informed of the execution.