A historical study documenting the emergence, thought, and systematization of the Catholic Church by Communist regimes worldwide. The book highlights how Communist regimes attempted to eradicate religion through policies of state atheism. This included the forced closure of religious institutions and schools and the confiscation of church property. Galter discusses how Communist authorities recognized the power of the church hierarchy. To weaken it, the regime employed divisive tactics among the clergy by creating internal divisions. The book details the arrests, imprisonments, and even murders of bishops, priests, nuns, and laypeople who refused to submit to state ideology. It also includes detailed accounts of the situation in various countries in Eastern Europe (such as the Soviet Union, Romania, Hungary, Poland) and Asia (including the People's Republic of China). This work serves as a memorial archive of the struggle of believers to maintain religious freedom during the Cold War. It is a frequent reference for historians studying the relationship between Communism and Christianity.