Islamic activists in Europe have taken a leaf out of the old communist guidebook for the "long march through the institutions." In Antwerp, Belgium, for example, the city council has been infiltrated by Islamist fundamentalists -- Belgian citizens, of course -- who keep pushing the envelope with impunity. From Leeds in the U.K. to Livorno in Italy and from Luxembourg to Slovenia's Ljubljana, multiculturalism is pretty much of a bust. Quicksand is the only common ground between Western values and militant Muslim fundamentalism. But some Islamist extremists have found willing partners among leftist radicals who never got over the end...