Neturei Karta in Iran: Zionists use Holocaust

this is an old article, but gives some insight into the Karta movement.
the few orthodox jews who are part of NK believe that Israel shouldn't exist as God had told the Israelites to not to take back their land by force (against the will of other nations).

Regular religious jews believe that, UN nations have approved Israel and thus the land wasn't taken back against the will of other nations, but the NKs do and therefore support all other groups (including palestinians) against the jewish state. the hasidic jews you've seen next to ahmadinejad in the conference belong to this group.