The Gray Notebook: A Collection of Protests Against Anti-Semitism and Persecution of Jews Issued by Non-Roman Catholic Churches and Church Leaders During Hitler's Reign covers an important historical period when Catholic churches and spiritual leaders spoke out against anti-Semitism and persecution of Jews during the Reich's anti-Semitic policies the Nazi regime. The book's author, Johan M. Snook, explores this aspect of history by presenting readers with a collection of protests and speeches that reflect the position of church leaders in the face of Nazi crimes. "Grey Notebook" is an important and well-documented work that sheds light on little-known pages of history and shows the importance of the voice of the churches in the confrontation with the totalitarian regime.