American Civil Liberties Union - The ACLU was born in the early 20th century when the government was rounding up "activists" and deporting them for fear that they were supporting the Communist Revolution. It started as a small organization and has blossomed into a massive driving force for protecting civil liberties.
Lincoln University - The Human Rights Issues in Criminal Justice class put together a great pathfinder that includes a very wordy page on Freedom of Religion.
University of Minnesota Human Rights Library - This is a really helpful study guide on freedoms of belief from an international perspective.
BOOKS & DVDs FOR INTER-LIBRARY LOAN