One thing that I learned from the Chambers book was that the Communists are extremely anti-Christian and that members of the communist party are explicitly forbidden to attend church.
I found this interesting because the CIO reported my grandfather to the HUAC as a communist and the FBI proceeded to destroy his life. They had to have known that the charges were false because my grandfather was an elder in his Methodist church. He and my grandmother were both very active in the church and the FBI interrogated all the church members as well.
What is the HUAC