One of the most potent weapons that global jihadists have to advance their cause is one of the least-remarked: censorship. And Rachel Ehrenfeld, founder and director of the American Center for Democracy, stands today as one of the primary targets of this tactic — and, by her ongoing resistance, one of the foremost defenders of the freedom of speech against encroaching attempts at legal intimidation that, if successful, will effectively silence the anti-jihad resistance.

Billionaire Saudi financier Khalid Salim bin Mahfouz sued Miss Ehrenfeld in the U.K. for libel: in her book, "Funding Evil," she wrote that he was involved in funding Hamas and al Qaeda. Mr. bin Mahfouz denied that he had knowingly given any money to either. Taking advantage of British libel laws that place the burden of proof on the defendant, rather than the plaintiff, Mr. bin Mahfouz sued not in the United States, where Miss Ehrenfeld lives and published her book, but in Britain, where neither he nor Miss Ehrenfeld live and where his entire case depended upon a handful of copies sold in that country mostly through special orders from Amazon.com, and the appearance of one chapter of the book on the Internet, where it may have been read by British readers.

Britain's libel laws have given rise to the phenomenon of wealthy "libel tourists," who sue there on the slimmest British connection in order to ensure a favorable ruling...