Conspiracy theories have existed for centuries to rationalize major events and crises, but while they were once relegated to the fringes of discourse, in recent decades, they have increasingly become part of public debate. While many conspiracy theories are innocuous, others, like Holocaust denial, are considered dangerous because their intention to legitimize racist or otherwise hateful ideologies. This resource helps readers to examine key debates and topics related to conspiracy theories. Balancing free speech and public safety, the development of conspiracy theorizing over the past century, the role the internet has played, and whether some conspiracy theories can actually benefit society are all richly analyzed.