Walter Joseph Ciszek, S.J. was a Polish-American Jesuit priest who conducted clandestine missionary work in the Soviet Union between 1939 and 1963.
Fifteen of these years were spent in confinement and hard labor in the Gulag, plus five preceding them in Moscow's infamous Lubyanka prison. He was released and returned to the United States in 1963, after which he wrote two books, including the memoir
With God in Russia
, and served as a spiritual director.
Since 1990, Ciszek's life has been under consideration by the Roman Catholic Church for possible beatification or canonization. His current title is Servant of God.