During the period 1914–1916 he was in internal exile in Turukhansk, Siberia, along with Joseph Stalin (then known as Dzhugashvili). Both had been betrayed by the Okhrana agent Roman Malinovsky. Of Stalin, Sverdlov wrote "The comrade I was with turned out to be such a person, socially, that we didn't talk or see each other. It was terrible." Like Stalin, he was co-opted "in absentia" to the 1912 Prague Conference. In 1914, Sverdlov moved to a different village, moving in with his friend Filipp Goloshchyokin, known as Georges. In early 1917, Sverdlov received news of the Putilov strike of 1917 in Petrograd. Alongside Filipp, he set out for Petrograd at once, arriving to Petrograd on 29 March 1917