Algerians, as a nationality, do not figure prominently on the British ethnic landscape. As a former colony of France, Algeria's historical links lie on the other side of the Channel. Its citizens form only a small percentage of Britain's 2 million Muslims. But for some reason, Algerian Islamic extremists turn up again and again as British security services widen their investigations into the al-Qaeda terror organization.
So far, more than a dozen Algerians have been arrested in Britain though many have been cleared and released in connection with terrorist activities. They are part of an extensive...