Moroccan Ghosts hacked Jewish institutions, replacing their homepages with this screen. Photo: ADL.

Facebook removed a page belonging to the Moroccan Ghosts, an anonymous hacker group that took credit for defacing the webpages of four Jewish institutions in the U.S., according to the Anti-Defamation League, which alerted the social media platform.

The Facebook page boasted of their cyber-attack: “Hack­ing 4 for­mal Zion­ist tem­ples in Amer­ica or in more accu­rate words [4] dirty places to con­spire and plot against Palestine.”

The hack­ed web­sites were of the Union for Reform Judaism’s institutions in Col­orado, New Jer­sey, Mass­a­chu­setts and Geor­gia, the ADL said on Tuesday.

They replacing the website homepages with an image of a man wrapped in a Pales­tin­ian flag, alongside the tagline, “When injus­tice becomes law … Resis­tance becomes a duty.”

In 2012, Moroc­can Ghosts defaced Jew­ish con­gre­ga­tional web­sites with their logo and an hour-long video deny­ing the Holocaust, the ADL said.

ADL said: “This lat­est cyber-attack is part of a larger trend of polit­i­cally moti­vated hack­ings tar­get­ing the web­sites of per­ceived sup­port­ers of Israel. ADL offers guid­ance to Jew­ish insti­tu­tions regard­ing online and dig­i­tal security.”