Although it nestles snugly in the gentle foothills of New York's Catskill Mountains, Camp Jedel is no bucolic summer retreat. It is surrounded by a metal fence guarded 24 hours a day by campers; a 30-ft. watchtower is under construction. There is no baseball diamond or basketball court; the swimming pool is empty. The 37 campers, including several girls, range from the ages of 13 to 19; they wear green Army fatigues emblazoned with the blue-and-white sleeve patch of the Jewish Defense League.
So far, the leaguefounded in 1968 by Rabbi Meir Kahanehas taken on neo-Nazis, allegedly anti-Semitic blacks and...