A shadowy quasi-organization aims to usurp the mainstream settlement lobby by launching a series of controversial demonstrations, moderate and radical settler leaders said Tuesday. On Monday evening, the group surprised the police and the media when it deployed several hundred protesters to some of Israel's busiest intersections during rush hour. They brought large swaths of the country to a halt as they scuffled with police and burned tires in protest of Prime Minister Ariel Sharon's plan to withdraw from the Gaza Strip. While some have dubbed it the "Jewish Tanzim," unofficial spokesmen for the mysterious group, affiliates of the right-wing...