I think Rabbi Kahane wrote about Zweibon in the JDL. I vaguely remember Rabbi Kahane saying that Herb was very powerful- he could crush heads of anti-Semites - or something to that effect.
Zweibon also turned on the Rav & even tried to steal both JDL & Kach from him.
Zweibon turned into a POS.
The was a whole court case & the court ordered a convention & the convention voted to keep the Rav as JDL's leader & boot Zweibon & his cronies.
But don't take my word for it ask Chaim.
He was there as was I.