Hezbollah

The 1978 Israeli invasion of Lebanon was provoked by PLO attacks on Israel but the Israeli invasion of Lebanon in 1982 was triggered by the attempted assassination of Israel's ambassador to the UK, Shlomo Argov, by gunmen from Abu Nidal —a rival, dissident Palestinian group—separate from and often at war with the PLO. 

Israeli Prime Minister Menachem Begin blamed Yasser Arafat’s PLO for the attack and used it as a casus belli. 

This was the invasion which brought Hezbollah into existence, midwived partly by Iran. 

If you choose you can call Hezbollah terrorists and Iran a sponsor of terrorism for fighting the Israeli invasion but it seems a wholly subjective matter. 

Every move in the Arab-Israeli conflict is in response to an earlier thing until you get back to the Balfour Declaration. 

That's where it all begins.

I remember Stephen Pollard tweeting that he would block any Neanderthal anti-Semite who denied that Hezbollah was a threat to the United Kingdom and I fell on his sword.

On the other hand let me be clear that I am not saying anything in support of Hezbollah.  

If I did so, thanks to the change in the law for which he was arguing, I could be arrested as I walk down the steps of the next plane I take to England and I could get 14 years in prison. 

"Freedom is England's secret weapon" said Stanley Baldwin - and also apparently according to AI, one Abdu'l-Bahá, who was the head of the Bahá'í Faith from 1892 to 1921. It is misattributed to Churchill. 

It's a free country stroppy girls in England used to say if you asked if you could sit next to them but I don't imagine anyone says it now.