Former leader of the British National Party Nick Griffin has been expelled from the group, it has been announced.
BNP party chairman Adam Walker said the 55-year-old politician was told of the decision today.
Writing on Twitter, Mr Griffin, who stepped down as leader in July after 15 years, accused the party of playing "plastic gangster games".
He added: "Breaking news! I've just been 'expelled' without trial from the #BNP!"
In a letter, Mr Griffin was told he was being expelled for "trying to cause disunity [in the party] by deliberately fabricating a state of crisis".
This included allegations that the ex-MEP prepared a report which lied about key party personnel and finances and approving the leak of the allegations on the internet.
The letter said: "We believe that, since being given the title of honorary president, you have put all your efforts into trying to cause disunity by deliberately fabricating a state of crisis.
"The aim of this was to again embroil the BNP in factionalism designed to destabilise our party."
A spokesman for the committee which made the decision said it had not been taken lightly but stressed that Mr Griffin's behaviour had become "more erratic and disruptive".
He added: "Although we all appreciate that Nick has achieved a lot for our party in the past, we must also remember that the party is bigger than any individual.
"Nick did not adjust well to being given the honorary title of president and it soon became obvious that he was unable to work as an equal member of the team and alarmingly his behaviour became more erratic and disruptive."
Additional reporting by PA
