Mohammed Zeki Mahjoub (Arabic: محمد زكي محجوب) (also Abu Ibrahim, Mahmoud Shaker) is an Egyptian national who was arrested in May 2000 on a security certificate for his alleged membership in the Vanguards of Conquest. Although he has not been charged in Canada, the Canadian Security Intelligence Service (CSIS) has stated that they believe he will "engage in or instigate the subversion by force of the government of Egypt" if allowed free. However, CSIS has refused to provide any public evidence to substantiate its claims.