Jim,
describing all Jewish members of a political party as being both stupid and politically ambitious,

No-one has ever said any such thing.
What a nasty lie and smear!

first in complaining that their party is full of Antisemites,

None of them have ever "complained" of any such thing!
Now you are smearing Labour Jews with your nasty lies.

then in refusing to describe that antisemitism for fear of upsetting the Party.

They have described it to the leadership.