Why Orwell made Goldstein a Jew?
It might be debatable, but Orwell paints a stereotypical image of a Jew for the apparently, but not unequivocally, mythical underground resistance leader named Goldstein. I think it is significant. Orwell knew the Nazi’s used the Jews as a scapegoat and that they were persecuted in Soviet Russia. The character of the Jews as being different but also historically persistent is what Orwell is projecting here and is what is needed for a tyranny’s scapegoat. The Jews also discovered conscience and morality which is what Orwell’s Party in 1984 stands opposite.
