This book examines the struggle of the Roman Catholic Church against persecution by the Nazi regime in Western Europe and the Communist regime in Eastern Europe. Ronald Seith seeks to document an often-overlooked chapter in history, highlighting the courage and steadfastness of Church servants in the face of oppression. The discussion focuses on the Nazi-occupied territories in Western Europe and the Communist persecution in Eastern Europe, which was still ongoing at the time of writing. Through this work, the author invites readers to understand the suffering of the Church while fostering sympathy and appreciation for those who maintained their faith amidst political and ideological pressure. Although not a Catholic, the author strives to present a fair and objective account of these events.