I am actually surprised that there is no subcategory for religious persecution targets in the Soviet Union or communism in general. All types of religion were strictly forbidden in the Soviet Union and clergies were literally hunted down and murdered whenever possible. My great-great-grandfather was murdered by the communists because he was priest.
Another example is Josef Kessler, he was the last archbishop of Tiraspol and actively protested against communism. He escaped by feeling to Germany.
I think there really should be such a subcategory. I'm not part of the Categorization Project so it would be great if a member could approve of this or even create it.