Journalist and author Jeff Guinn on what can be learned from David Koresh and the Waco siege and how an FBI coverup continues to stoke the fires of government distrust three decades later.

In three decades as an undercover operative for the Bureau of Alcohol, Tobacco, Firearms and Explosives, Vincent A. Cefalu risked his life investigating groups from outlaw motorcycle gangs to the Ku Klux Klan. Cefalu spoke with us about the undercover moments that frightened him most.

Debates around and other little-known facts about the leader of the Branch Davidians, David Koresh, and the Waco siege.