Crusaders is a term used by Islamists to refer to any Western presence in the Middle East, though it is most often used to refer to the U.S. In addition, anti-Muslim extremists in the United States often refer to themselves as Crusaders or use imagery from the Crusades. In 2016, for example, members of a small militia group known as "the Crusaders" were arrested for plotting to blow up an apartment complex in Kansas that largely housed Somali immigrants.

This database provides an overview of many of the terms and individuals used by or associated with movements and groups that subscribe to and/or promote extremist or hateful ideologies.