Big Mick and Martin,

I'm afraid that you're both wrong about the origin and usage of the slogan, "never again."

The slogan was coined by Holocaust survivor and noted author and commentator Elie Wiesel as a refusal to allow the Holocaust to ever be repeated. With Wiesel's approval, the slogan has been adapted to refer to other genocides as well.

Big Mick,

Yes, the slogan was also used by the JDL, a never more than marginal fringe group within the Jewish community that is now all but defunct and forgotten. But the slogan was in wide use for many years before the JDL came on the scene.

Martin,

The slogan does have great resonance in Israel and in American synagogues and temples, but the reference is to the Holocaust.