Counter terrorism / counterterrorism (CT) appears in a large number of threads and arenas. Some threads refer to individual nations or regions, for examples France and Europe respectively.

This thread's theme is CT in the widest sense after twenty two threads were merged, most of them recent 2015-2016. There are many threads on terrorism which defy merging.

There is an old thread A Counter Terrorism reading list which has not been updated since 2011 and is now closed.