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Mark "Mordechai" Levy is a U.S.-based political activist and founder of the militant Jewish Defense Organization (JDO), a breakaway faction of the Jewish Defense League. David Tell of the Weekly Standard wrote that the group is "located at the farthest, shadowy margins of American public life." Levy has organized a paramilitary training camp located in Upstate New York, named after Revisionist Zionist leader Vladimir Jabotinsky.