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Stalin was not a priest although he studied for the priesthood for a brief time at the Tblisi Spiritual Seminary.
Joseph Stalin studied at the seminary as a young man but did not complete his studies.
A Seminary (religous school) in Gori, Georgia (Europe).
Stalin studied various subjects in a seminary before he was thrown out for his revolutionary attitudes and activities.
Tbilisi Theological Seminary
Stalin did study at a seminary for a while so for some time at least he anticipated being a priest.
No, but he studied for the Russian Orthodox priesthood at the Tiflis Spiritual Seminary for a short time.
Yes, Stalin had Trotsky killed eventually. However, before that he had Trotsky kicked out of USSR politics and then the USSR itself.
Yes he did. He studied at the Gori Spiritual school and then at the Tiflis Spiritual Seminary. He was going to be a priest according to his mother's wishes. As a young man, Stalin even published some poetry.
He was probably expelled for revolutionary activities, though skipping exams is also a possibility.
Stalin's mother had hoped that he would become a priest, and it appears that he did enrol to become one. The circumstances of his expulsion from the seminary are disputed, but it appears that he was considered unreliable and not a good student.