From an article linked from Drudge:
"He is really accountable to no one, and that is the history," said former priest Richard Sipe, author of the 1990 book, "A Secret World" about the priesthood. "There have been a pope or two who have resigned, several hundred have been murdered, but it's a very stable organization from the top down. What other monarchy do you know that's lasted for 2,000 years?"