That organization was called the Judenrat, and they were the Jews that ran the Ghettos. They bent over backwards to please the Nazis. When Jews who escaped concentration camps made their way back to the ghettos to warn about the gas chambers, the Judenrat members chose to believe, and side with, the Nazis instead of their fellow Jews. Another person that J Street reminds me of is Josephus. He showed the Romans the passageways to breach the walls of Jerusalem. So you see, J Street members are just carrying on a tradition, albeit a pathetic one, in the Jewish community.
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: Dershowitz lays into J Street in AIPAC conference dust-up