Neo-Nazi group the White Wolves, which has launched a sinister campaign of racist death threats, is named after a Serbian terrorist group.
The White Wolves is a breakaway faction of Combat 18, one of Britain's most notorious extremist groups.
Mr Mike Whine, of the Board of Jewish Deputies, said: ''The organisation comprises only half a dozen people but then you do not need many to carry out an act of violence.''
Up to 25 people have contacted the the Board of Jewish Deputies after receiving identical death threats from the White Wolves.
Mr Whine said of the White Wolves: ''They are named after a Serb terrorist group that was terrorising Kosovars in Serbia. Some people from Britain and Germany had gone as volunteers to Serbia and brought the name with them.''
Police have taken the letters for DNA testing.
The letters read: ''Notice is hereby given that all non-whites (defined by blood, not religion) must permanently leave the British Isles before the year is out.
''Jews and non-whites who remain after 1999 has ended will be exterminated. When the clocks strike midnight on the 31st of December 1999 the White Wolves will begin to howl and when the Wolves begin to howl the Wolves begin to hunt. You have been warned. Hail Britannia.''
Ms Oona King, Labour MP for Bethnal Green and Bow, in whose constituency Saturday's Brick Lane bomb exploded, received a letter before last week's Brixton bomb.
Mr Gerald Hartup of the anti-racist group, The Freedom Association, received a letter on April 15.
Eastern Eye, one of the biggest Asian community newspapers in Britain, also received a threatening letter from the White Wolves.
Editor Siddy Shivdasani said the paper received the letter the day before the Brixton bomb but because they are sent five to six racist letters every week, staff thought nothing of it.
''We're convinced it's the same people behind both bombs who've also been threatening us,'' he said. He was disappointed with the police response. ''It took them a long time to see Brixton as a racist crime.''
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