I saw a video somewhere on youtube about the old KGB infiltrating high levels of the Vatican. It looked legit to me.
But with all due respect to the RCC, I really don't think the Vatican needed much help getting corrupt.
imho, any group--particularly a 'religious' group--older than about 1.5 years--certainly 3 years--the rot has already started to set in and multiply.
And the more hierarchical and authoritarian the leadership--the worse and more rapidly the rot sets in.
Christ's hostility was greatest for the 'religious' bureaucracy of his day--who thought they were the most faithful to God's law and the most righteous compared to all the other children of Abraham, Isaac and Jacob. Christ disagreed.
Christ won.