The hardline Jewish activist Roberta Moore was this week accused of being a divisive figure in the far-right's attempts to enlist support from members of the mainstream Jewish community.
A year ago the extreme right-wing English Defence League launched a "Jewish Division" to encourage the community to "lead the counter-Jihad fight". Led by Brazilian-born Ms Moore, the division attempted to link to the far-right American Jewish Task Force, leading to tensions with the main EDL leadership.
In February an EDL spokesman admitted Ms Moore's "gung-ho attitude" had "caused a great deal of trouble and unrest".
A new group, the Jewish Defence League of Great Britain, has now also distanced itself from Ms Moore.
The JC understands the number of EDL Jewish Division supporters amount to around a dozen people, only a few of whom are actually Jewish.
Clarifying exactly who supports which organisation, and how many genuine supporters groups have, is difficult because activists use aliases, fake profiles and secret codes in online forums.
Gavin Williams, who claims to be a non-Jewish former administrator of the division's Facebook group, said he had withdrawn his support over concerns about Ms Moore's conduct.
He said: "What is being posted is mainly to do with Muslims. I told Roberta that the extremism had to stop. I've walked away because I don't want to be associated with it."
In a message posted on the Jewish Defence League of Great Britain's own Facebook group on Sunday, Andrew Gatward, who says he is an "Orthodox Jew of Hungarian descent", also attacked Ms Moore.
He wrote: "She is not part of JDL Great Britain, nor are we associated with anything Ms Moore is involved in. We are nothing to do with the EDL's Jewish Division whatsoever. This woman and everything she does is dangerous for the Jewish cause."
But Ms Moore said: "I am not an extremist. These are lies from those who intend to destroy our group.
"Our division was created to support Jews and Israelis and to raise awareness of issues regarding terrorism and Islamisation. We work against Nazis, neo-Nazis, Islamo-nazis, racists, fascists, communists and socialists.
"Things stand as they always stood. Nothing has changed from the moment we opened our division. "
A CST spokesman said: "Members of the Jewish community have been repeatedly warned about the dangers of getting into bed with the EDL's actions and activists".
A joint initiative was launched last November by more than a dozen Jewish organisations in an attempt to combat Jewish support for the EDL.