Far-right group New Dawn Party is thought to be planning a rally against the Jewish community in London.
A post sent from a Twitter account in the name of the group read: “Oppose the 'Shomrim' demo. Golders Green. Saturday July 4th Details to follow.”
A spokesperson for the Community Security Trust said it was aware of the proposed demonstration.
The organisers were thought to be the same group of far-right nationalists who staged a small rally against the Charedi community in Stamford Hill earlier this year .
Mark Gardner, director of communications said: "CST is fully aware of this explicitly antisemitic demonstration, and has discussed it in recent weeks with police and government.
"It follows a similar demonstration in Stamford Hill that was quite pathetic and was largely ignored, but we are fully aware of the possible impact of such an event in Golders Green and are planning accordingly."
In February white supremacist Joshua Bonehill-Paine said he was planning a "Liberate Stamford Hill" demonstration.
The area is home to Europe’s largest strictly Orthodox community.
In a supposed "appeal against the Jewification of Britain", he claimed there was an "on-going foreign occupation" of the area, with an "occupation force of approximately 50,000 Jews".
He encouraged supporters to oppose the work of the Shomrim volunteer security group, claiming it enforced "evil Talmudic Jewish Law" and allowed white children to be groomed and sold as sex slaves for Jews.
Bonehill has faced a series of criminal charges for incidents including malicious communications and harassment.
He was described as a "moronic" hoaxer last April after admitting in court that he had published false claims about immigrants.
