In response to the Charleston church massacre this summer, the SPLC has produced a training video to help law enforcement officers combat “lone wolf” domestic terrorists.

Designed to be shown to officers during roll call, Understanding the Threat: The Rise of the Lone Wolf focuses on violent extremists who commit acts of terror entirely on their own, without the help, financing or guidance of other individuals or groups.

Earlier SPLC training videos have focused on “sovereign citizens,” people who believe most laws don’t apply to them; racist skinheads, known for their brutality and affinity for violence; and Aryan prison gangs, which have increasingly spilled from behind bars onto city streets.