Pope Francis mentioned "Catholic" Communist Dorothy Day in his speech to US Congress - that we should look up to her so I checked Google about her and got shocking results:
Dorothy Day, a Communist?
https://catholiceye.wordpress.com/2013/04/10/dorothy-day-a-communist/
Senator calls Dorothy Day 'a woman of loathsome character'
http://ncronline.org/blogs/ncr-today/senator-calls-dorothy-day-woman-loathsome-character
Dorothy Day, "Catholic Communist" Propagandist and Agitator
http://dorothydayworker.blogspot.com/2012/05/dorothy-day-catholic-communist.html
The Catholic Communizer Dorothy Day.
http://www.catholicamericanthinker.com/Catholic-Communizer-Dorothy-Day.html
Socialist Dorothy Day Being Prepared for ‘Beatification’
http://www.traditioninaction.org/HotTopics/k004_DorothyDay.html
Also Pope mentioned "Catholic" theologian Thomas Merton who got heavily into Eastern Mysticism.
http://www.catholic.com/magazine/articles/can-you-trust-thomas-merton