It's hard to imagine the things that happened between those walls over the years. Definitely wouldn't want to end up there back than. It is a little creepy thinking of the many that got tortured there. I imagine actually visiting there now it has an uneasy feeling.
I can't believe church priest were used to gain information. I agree with you Church and State should be separate from one another. I imagine one would have had to keep a quiet tongue even amongst those who thought could be trusted.
You have to be ready to accept what you see, but you know how it is. It's one thing to imagine and a totally different thing to live it. It's sad though.
The problem is not that the church priests were used to gain information, but that these priests collaborated with those forces. One of the goals of the church should be to protect and guide their followers, not to sell them out to the highest bidder. The Vatican has a shady past as well.
There were exceptions as well, stand-up people, like Jerzy Popiełuszko, who paid with his life for doing the right thing.