Four factors are driving the increasing hybridization of extremist ideologies.
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Counterterrorism experts need to get ahead of the curve of terrorist innovation with new, commercially-available products.
Historians' knowledge of primary sources, contextual nuances and contingent events show that they have much to offer scholars and policymakers working on terrorism.
Now that Afghanistan is no longer an area of active hostilities, strikes should be subject to the standard of near certainty.
The United States has a range of options for its new Afghanistan policy.
Al-Qaeda will now have a more permissive environment in which to operate, but the precise context will be important for the U.S. policy response.
White supremacists and other far-right ideologues are drawing inspiration from Ted Kaczynski's anti-technology manifestos.
The surge of global internet regulation to combat terrorism and other harmful digital content continues to pose a risk to the freedom of expression online and the rule of law and leaves unanswered many questions about effectiveness.
Spain's close counterterrorism cooperation with Morocco provides a model for effective international efforts to prevent terrorist attacks.
The political violence perpetrated by white supremacists in response to Reconstruction and its long-term effects hold lessons for modern counterterrorism policy.