What is Madalyn Murray O'Hair?

a angry atheist activist, now deceased. She traveled the nation to proclaim the non-existence of God. And she hated religion. She wasn't just an atheist. She was really, really mad about it. And she was an aggressive woman. And a real Large Marge. Even Ayn Rand, herself an atheist and angry as well, disdained her.

She went missing for over a year and finally turned up murdered.