In the 1990s, al-Masri turned London's Finsbury Park Mosque into a training ground for extremist Islamists, attracting men including Sept. 11 conspirator Zacarias Moussaoui and "shoe bomber" Richard Reid.
Two other defendants, Syed Talha Ahsan and Babar Ahmad, pleaded not guilty in federal court in New Haven, Conn., on Saturday morning. They were jailed until trial, and their lawyers declined to comment after the arraignment.
Ahmad and Ahsan face charges that they ran websites that sought to raise cash, recruit fighters and seek equipment for terrorists in Afghanistan and Chechnya. Authorities say the websites included Azzam.com, which investigators say was used to recruit members for the al-Qaida network, Afghanistan's ousted Taliban regime, and Chechen rebels.