One of the most powerful weapons Islamists have is the threat to use the courts to silence people who get in their way. That's why it was so heartening to learn that on April 30, New York Gov. David Patterson signed into law the Libel Terrorism Protection Act, which is critically important in protecting the First Amendment rights of persons who report factually about terrorism. The legislation is commonly referred to as "Rachel's Law," named after Rachel Ehrenfeld, director of the New York-based American Center for Democracy. Miss Ehrenfeld, a scholar who has dedicated her professional life to the study of terrorism, ran afoul of Saudi billionaire Khalid Salim bin Mahfouz. Miss Ehrenfeld (who has been published numerous times in this newspaper) wrote in her book "Funding Evil" that Mr. bin Mahfouz was involved in financing Hamas and al Qaeda; Mr. bin Mahfouz denied that he had knowingly donated to either group.