Algerian and Western counterterrorism efforts, along with an African-led peacekeeping force in Mali, have shifted the North African al-Qaeda franchise's criminal and terrorist activities to remote areas of the Sahara and Sahel, explains this Backgrounder.
Hezbollah's long-standing resistance to Israel gained this Lebanon-based Shiite political party and militant group broad support, but its involvement in Syria's civil war may jeopardize its domestic standing.
Pakistan has emerged as a sanctuary for some of the world's most violent groups, including al-Qaeda, the Taliban, and homegrown militants, that threaten the stability of Pakistan as well as the region.
Islamic State of Iraq and Syria (ISIS) has capitalized on Iraq's Sunni minority's alienation from the state, driven by sectarian politics and heavy-handed approaches to security, to wreak havoc and establish zones of authority while expanding its reach into neighboring Syria.
Al-Qaeda in the Arabian Peninsula has emerged as one of the most dangerous al-Qaeda affiliates, strengthening amid political unrest in Yemen. This Backgrounder examines the group and U.S. counterterrorism operations.