Alexander Ilyich Klibanov (1910–1994) – historian and religious scholar, author of fundamental studies on Russian heresies and sectarianism. In 1936, following his scientific supervisor, ethnographer M.N. Matorin, A.I. Klibanov received a five-year sentence as a member of the counter-revolutionary Trotskyist-Zinovievist organization, and in 1948 he was re-arrested in the same case and sentenced to ten years. This book contains the correspondence of A.I. Klibanov with his wife, Natalya Vladimirovna Yeltsina, from 1932 to 1954, but most of the letters date specifically to the second camp period. In the 1980s, in the wake of perestroika revival and disputes about the Soviet legacy, Alexander Ilyich Klibanov began preparing these letters and comments on them for publication, but did not have time to complete the work. Now, thirty years after his death, the book conceived by the scientist is being published. Two introductory articles were written by the philosopher and religious scholar, professor of PSTGU K. M. Antonov and the Slavic historian, professor of Moscow State University and the Higher School of Economics M. V. Dmitriev.