Anjem Choudary, Britain’s most notorious radical Muslim preacher, has been formally charged with enlisting British citizens to support ISIS. Choudary, along with one of his top protégés, stands accused of “inviting support” for the vicious Islamist terror group between 29 June 2014 and 6 March 2015, according to British media reports. The Islamist leader is a high-profile sympathizer of the so-called “Islamic State” group, and has previously founded and headed a number of extremist Muslim groups which were subsequently banned as terrorist organizations by the British government. But Choudary—a 48-year-old former British law student—has proven adept at circumventing UK anti-terror...