six hostages in particular were kept Temporary_stay because they were men and american citizens , not necessarily jews : robert norman schwartz , a u.s. defense Defending department researcher stationed in thailand ; james lee woods , schwartz 's assistant and security detail ; gerald berkowitz , an american-born jew and college chemistry professor ; rabbi abraham unk and his brother rabbi joseph unk , two brooklyn school teachers ; and john hollingsworth , a u.s. state department employee .