The Man Who Knew (full documentary) | FRONTLINE

Summary

FBI agent John O'Neill recognized the growing threat of Al Qaeda and Osama bin Laden, but his warnings were dismissed by FBI headquarters, leading to catastrophic failures on 9/11. O'Neill's persistent investigation into the Ramzi Yousef case revealed the interconnectedness of global terrorism and bin Laden's intentions. The takeaway is the critical importance of heeding warnings and addressing intelligence failures to prevent future tragedies.