Father Paolo Maria Siano of the Order of Franciscans of the Immaculate and excellent connoisseur of Freemasonry addresses the question as to whether the well-known Jesuit and theologian of the 20th century was a Freemason. "Freemasons not, but Masonic minded"
Father Siano wrote on the subject in 2007 an essay: Karl Rahner, massonico '? Il pensiero di Karl Rahner e la Cultura Massonica a confronto (The "Masonic" Karl Rahner Karl Rahner's Thought and the Masonic culture in comparison?), In: Fides Catholica 2 (2007) 2, pp. 315-360 . An English translation is not yet available. Could this be but one reason why the Order is being broken today?
Link to Katholisches....
Edit: it doesn't seem to be available on Amazon, either.