The book of Metropolitan Theodosius (Protsyuk) examines the history of the Church in Ukraine from 1917 to 1943. The work was presented by the author for defense as a candidate dissertation at the Moscow Theological Academy in the late 1970s. During this time, church-historical science has stepped far forward, however, the materials collected by Metropolitan Theodosius retain their scientific value. Despite the past years, the history of the Orthodox Church in Ukraine in the first half of the twentieth century remains poorly understood.