Home Secretary Theresa May faced mounting pressure yesterday to stop Hungarian fascist leader Gabor Vona peddling his ideology of hate on the streets of London.

Mr Vona - head of the far-right Jobbik Party and founder of the outlawed paramilitary Hungarian Guard Movement - plans to descend on Holborn, London, on Sunday, the eve of Holocaust Memorial Day.

Jobbik says he is visiting to hold a "meeting" with Hungarian expatriates and has denied reports that he plans to meet representatives of Greek neo-nazi outfit Golden Dawn or the British National Party.

Labour London Assembly member for Barnet and Camden Andrew Dismore has asked Ms May to issue an exclusion order to keep the fascist out.

"Our Jewish and Roma communities in London, for whom Jobbik reserves special hate, need defending against its filthy ideas," Mr Dismore said. "All our residents need protection from the undesirable audience of far-right activists he is likely to attract."

Jobbik has a history of Holocaust denial and the Hungarian Guard Movement has been blamed by police in the country for multiple murders of Roma people.

In his new year message at the start of this month Mr Vona called for "drastic, draconian" measures against Hungary's Roma community, demanding "the criminalisation of the Gypsies" and saying a Jobbik government would introduce the death penalty and "chemical castration."

Anti-fascist campaign group Hope Not Hate called on the Home Secretary to heed Mr Dismore's request for a ban on the visit.

"Jobbik is a violently anti-semitic, anti-Roma party whose followers have been involved in intimidation, violence and murder," spokesman Matthew Collins told the Star.

"There is no place for Gabor Vona or his nazi Jobbik Party in Britain any more than there is a place for Nick Griffin's BNP."

And London's Communist Party district secretary Steve Johnson said that timing the visit for the eve of Holocaust Memorial Day was particularly offensive.

Hundreds of thousands of Hungarian Jews and Roma were rounded up by the country's fascist Arrow Cross movement during World War II and handed over to the nazis for extermination.

"To give a Hungarian fascist a platform in London this weekend is an insult to the victims of nazi genocide," Mr Johnson said.

"It shows the fascist threat is still real and demonstrates the ongoing need for unity against racists seeking to incite divisions and hatred."

Holocaust Memorial Day Trust chief executive Olivia Marks-Woldman said the day was "an international day of reflection on the Holocaust and genocide where we learn lessons from the past.

"We condemn any attempt to distract from this message."

The Home Office said it could not comment on individual cases or if someone was under consideration for exclusion.