Khalid Sheikh Muhammad was the mastermind behind the 9/11 attacks, the Bali Nightclub Bombing in Indonesia, and the 1993 World Trade Center bombing. He is currently imprisoned inside Guantanamo Bay detention camp.
Khalid Ahmed Showky Al-Islambouli was an Egyptian army officer who planned and participated in the assassination of Egypt's third president, Anwar Sadat, during the annual 6th October victory parade on 6 October 1981. Islambouli stated that his primary motivation for the assassination was Sadat's signing of the Camp David Accords with the State of Israel. He was tried by a military tribunal, found guilty, and sentenced to death. Following his execution, Islambouli was declared a martyr by many radicals in the Islamic world, and became an inspirational symbol for radical Islamic movements as one of the first 'modern martyrs' for Islam.
Khālid al-Bakrāwī, also known as Abū Walīd al-Baljīkī, was a Belgian national of Moroccan descent, confirmed to be the suicide bomber at the metro station in the 2016 Brussels bombings.
Khalid is also used in Chechnya (a traditionally Islamic country) as a first name for men. Since Chechnya is forced to follow the Russian naming system, it is also found as a middle name in the form of a patronymic, namely Khalidovich.