“The violent threat, the threat that is ideological is very much from the right…I think the ideological movement that is anti-Semitic is the right-wing movement,” de Blasio said, referring to the increase of hate crimes in New York City.

Hate crimes against all minority groups are up 64% compared to this time last year. Antisemitic incidents have spiked by 90%.

The mayor is a little bit correct, and very much wrong.

True, antisemitic violence has come from the right. The murders at Tree of Life Synagogue, the synagogue in Poway, the antisemitic chants at Charlottesville (“The Jews will not replace us!”) — all have come from the right.

But, how is he wrong?

“The threat that is ideological” does not only come from the right.

It comes from the left as well.

Consider the new book by Deborah Lipstadt — Antisemitism Here and Now.