The notorious anti-Zionist activist Tony Greenstein has been suspended for three years from the Unison union, just nine months after being expelled from the Labour Party.

Mr Greenstein was expelled from Labour in February over abusive behaviour that included writing blog posts about veteran Jewish Labour MP Louise Ellman as the MP for “Tel Aviv South” and a “racist supporter of the child abuse of Palestinian children”.

He had been accused by Unison of having “broken union rules” and engaging in “disrespectful or intimidating behaviour”.

The allegation stems from articles published by Mr Greenstein in which he attacks a senior Unison official, Steve Terry, over the treatment of Stan Keable, who was dismissed from his job in the union after being filmed in March arguing about the background to the Holocaust and claiming the Zionists had “collaborated” with the Nazis.

In a blog post written on Monday, Mr Greenstein wrote that he had been “sentenced to the maximum possible punishment (bar expulsion) which was three years’ suspension with loss of membership rights”.

He claimed Mr Terry was “a fulsome supporter of the idea that support for the Palestinians is ‘antisemitic’ and in particular criticism of Zionism. That is why Stan was abandoned and that is why I was subject to a bogus ‘investigation’.”

Mr Greenstein also wrote: “Unison is not a left-wing union… Despite the fact that Unison has good policy on Palestine and supports BDS it has also supported the false ‘antisemitism’ campaign.”