As the 20th anniversary of the Sept. 11, 2001, attacks approaches, a new biography by journalist Peter Bergen traces Osama bin Laden's path from a shy, religious teenager to the leader of a global jihadist group dedicated to mass murder.
Ali Soufan investigated terrorism cases and opposed the CIA's use of torture following the Sept. 11 terror attacks. After a legal battle, the redacted material in his 2011 memoir, Black Banners, has been restored.
.J.M. Berger studies extremists, their twisted ideologies, the misinformation they feed on, how they use social media to amplify their message and recruit new followers, and the violent acts they incite and commit.
Author Ron Suskind's new book, The One Percent Doctrine, is an investigation into the guarded world of anti-terrorism policy. He also reveals that al-Qaida was planning an attack on the New York City subway system.
Reporter Gregory Johnsen talks with Fresh Air's Dave Davies about the humanitarian crisis in Yemen and how the chaos is impacting the U.S. fight against al-Qaida. Johnsen describes a country torn apart.