FBI and Religion is the first book to examine the fraught relationship between the Federal Bureau of Investigation and religious groups that have developed in the United States in the last century. Encompassing religious groups that run from established institutions to extremist groups, and covering a period that includes the World Wars, the Cold War, the Civil Rights movement, and 9/11, FBI and Religion tackles questions important to the understanding of American religion, the history of law enforcement, and the future of religious liberty.