"but many promininent members have said that it is (more anti-Semitic than any other)."

And they have, but not in so many words.

Having lost the actual debate you are again just desperately trying to get me on something, but all you can do is nit pick trivia.

OK.
I withdraw "but many promininent members have said that it is." and insert,
"but many promininent members have said that Labour has a serious problem with anti-Semitism which, they have not said about any other Party, and which no-one else has either"

Also only Labour Party Jews have complained about their party's anti-Semitism.