On the night that the 16-year-old Palestinian teenager Mohammad Abu Khdeir was kidnapped, beaten and burned alive in a Jerusalem forest as the Israel-Gaza war raged in the summer of 2014, Lehava and other activists were out on the streets of Jerusalem, spouting racist and violent propaganda, Giora, an activist from 'Talking in the Square' says.'In the summer of 2014, they used to shout 'death to Arabs', but the police told them it's illegal.Racist extremists who set up a 'hotline' to inform on Jews in a relationship with 'Arabs' and who targeted Facebook founder Mark Zuckerberg are openly peddling hate and violence - but the Israeli government won't act.
Rotund, bearded and wearing a large yarmulke, he scrolls patiently through his smartphone whilst sitting in a Jerusalem hotel foyer, showing an example of an email received through Lehava's Hotline.'We get about 10 calls a day, from all over Israel,' he says.
'A few days ago, I got this: 'my 15 and a half year old daughter met a guy, she then met him again on a Friday and now she won't answer the phone - and she doesn't want to come home'.
After the main course, a video of the event shows some of the guests wearing masks and dancing and jabbing the air aggressively with table knives.
In person, Benzi Gopstein is at pains to come across as a softly-spoken and calm individual who claims to have the best interests of the Jewish people at heart.
And if you marry a non-Jew, it just means 'I don't give a rat's ass about what God says -I want to be like everyone else who don't have a God.'Founded in 2009, Lehava means 'the flame', and is also an acronym in Hebrew for 'Preventing Assimilation in the Holy Land'.
For the activists, a relationship between a Jew and a non-Jew is a Biblical sin - and something to be fought against.
Yet despite being under investigation for four years, the hate-filled campaigners operate in the central square of Jerusalem where they openly incite violence every Thursday night, the eve of the Israeli weekend.
Supermodel: Bar Rafaeli, who is Jewish and was dating Leonardo Dicaprio, is one of the high-profile names who have been urged not to marry outside their own religion by far-right radical fringe group Lehava'To do what God says you're supposed to do, not what you think in your head that you're supposed to do.
On the group's current answerphone message, Lehava praises 'Avihay Bakery', saying 'finally they fired the Arab who bothered the Jews'.
This and other activities amount to incitement to violence, argue critics.
'If I will go to her and tell her: what you're doing is wrong, she's going to tell me to go away,' he says.