Mugniyah began his career in terrorism in the 1970s with Force 17, the personal bodyguard detachment for Yassar Arafat, and later joined Hezbollah.
His more infamous terror attacks include the April 1983 bombing of the U.S. embassy in Beirut, killing 63; the October 1983 simultaneous truck bombings on the U.S. Marine and French paratrooper barracks in Beirut, killing 241 Marines and 58 French soldiers; the hijacking of TWA 847; the kidnappings and murders of U.S. military, intelligence and diplomatic personnel in Beirut; the bombing of the Israeli embassy in Buenos Aires, Argentina in 1992, killing 29 people; the bombing of a Jewish cultural center in 1994, killing 86 people.
He is suspected of direct involvement in the 1996 bombing of the Khobar Towers in Saudi Arabia, killing 19 U.S. servicemen. He was also behind the kidnapping of two Israeli soldiers in Northern Israel, the event which triggered the Israel-Hezbollah War in July 2006.
Mugniyah likely played a role in the establishment of Iran's ratlines into Iraq and the creation of the Special Groups, which have been built to mirror Hezbollah.
Mugniyah had extensive links with the Iranian intelligence services, and was directly linked to al Qaeda and Osama bin Laden, and former al Qaeda in Iraq commander Abu Musab al Zarqawi. Mugniyah was on FBI's list of 22 most wanted terrorists, with a $5 million dollar reward for information leading to his capture.
Couldn't have happened to a nicer guy.
Make sure to read the whole story from Bill Roggio.
Update: Thomas Joscelyn of the Worldwide Standard with a focus on the Mugniyah - al Qaeda connection.