They have lived mostly unnoticed in France for years, some raising large families. Now, they are being tracked, investigated and expelled.
Muslim prayer leaders, or imams, preaching a radical brand of Islam are seen as a new public danger. But critics contend the aggressive French policy could do more harm than good.
At least five imams have been expelled, arrested or threatened with expulsion, and there is little doubt that others will find themselves on a flight out of France -- or named in a police blotter.
Other European countries have taken only limited action against radical imams.
Authorities in Spain, looking to curb Islamic extremism blamed for the deadly March 11 train attacks, are considering a crackdown with a law to monitor imams.
But none of France's neighbors has set out a policy like Paris of actively going after imams whose discourse veers into a defense of violence or espouses values counter to democracy or human rights.
Radical imams "are a natural bridge toward violence, that is, toward terrorism," said Stephane Berthomet, a former anti-terrorism investigator with the Interior Ministry. They also were a "social danger," he said, because "they reject the French system."
On Saturday, police detained an imam whom the Interior Ministry said was the leader of an extremist movement that advocates violence and terrorism.
Midhat Guler, 45, a Turkish imam at a Paris mosque, immediately applied for political asylum. Guler, who has lived in France for 28 years and has five children, was director of the mosque since 1984, his son, Abdurrahman Guler, told French television.
Two imams were expelled last month, including Abdelkader Bouziane, an Algerian imam who was quoted by local media as saying that he favors wife-beating and stoning of women. The Interior Ministry said he also advocated violence in his sermons.
A court quickly ruled against the expulsion and said that Bouziane -- who has 16 children from two wives -- could return to France.
The succession of expulsions has drawn concern from some Muslims.
Lhaj Thami Breze, president of the powerful Union of Islamic Organizations of France, considered close to Egypt's Muslim Brotherhood, says the expulsions are an excessive reaction and the fanfare that accompanies them is unwise.
"This feeds the fear in the Muslim community that it, once again, is being singled out," Breze said. "It gives the impression that France is persecuting Muslims."
Breze said the French Council for the Muslim Faith, created last year to serve as a link between Muslims and the government, should be allowed to mediate in such cases.
Offenders should go before a court rather than be expelled, he said.
His organization, the UOIF, plans a May 31 meeting of imams of the Paris region on the contents of sermons.
Concern over radical imams is less apparent among France's neighbors, except for Spain. Interior Minister Jose Antonio Alonso said in a newspaper interview that he is considering legislation to monitor imams.
"We are talking about a phenomenon that can create a breeding ground for terrorism that kills people," Alonso told El Pais.
Elsewhere, Italy ordered an imam from Senegal deported in November, deeming him a "danger to state security" after he warned that Italian soldiers as US allies in Iraq and Afghanistan risked attack -- days before 19 Italians in Iraq were killed.
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