Steve,
In general they do not support the current actions of the extreme right-wing regime in Israel, seeking a more inclusive and less combative way forward.

Of course not. They are lifelong Labour activists! Jews have been an integral part of the Labour Movement from its beginning.
All they are objecting to now is the antisemitism that has very recently become prevalent, along with misogyny and homophobia.

It is silly of you to pretend it is not a significant issue and to call me names and ridicule me for showing that it is. It is a live issue.

Sky News yesterday,

"By Jason Farrell, Senior Political Correspondent
Jewish MPs are outraged by the latest claims of Momentum activists that allegations of anti-Semitism within the Labour Party are exaggerated."

"National Chair of the Jewish Labour Movement, Jeremy Newmark was invited to the Momentum event and challenged the room to produce examples of a "conspiracy to silence legitimate critique of the state of Israel" within the Jewish community.

He claimed that Ms Walker's "use of an anti-Semitic myth" about the slave trade caused "hurt and pain" and led to verbal abuse of a Jewish Labour member.

He argued that there was a serious problem of abuse in the Labour Party"

"Jewish MP Luciana Berger responded to comments from the Momentum meeting, saying: "Those of us at the sharp end of abuse and attacks will be the judge of whether anti-Semitism has been exaggerated or not." "
http://news.sky.com/story/jewish-mps-angry-at-claims-that-anti-semitism-is-exaggerated-10593739