text: I read about how bishops at Vatican II weren't allowed to issue a condemnation of Communism in order to secure Russian Orthodox ecumenical participation.
  
  The treatment of Cardinal Mindszenty comes to mind as well.
  
  Also, we have the current Vatican desperate to cut a deal with China, where faithful Catholics have to practice underground because of the Communist authorities. I'd read up on Cardinal Zen and what he has to say about all this.