UKIP has suspended Winston McKenzie as chairman of its Lambeth and Croydon North branch.
The rest of the committee has also been suspended and the branch has been disbanded, at least temporarily, after the party intervened following months of infighting.
Mr McKenzie has received a letter of no confidence signed by a number of members who have called on him to step down as chairman of the branch.
The group has asked Ukip's executive committee to deselect him as prospective Parliamentary candidate for Croydon North at next May's general election.
The Advertiser reported yesterday that Mr McKenzie, a former boxer, faced losing both positions after losing the confidence of branch members and senior figures within the party.
Mr McKenzie, who admitted his "career is at stake", admitted he and the committee had been suspended when contacted by the Advertiser but declined to comment further.
Ukip has yet to issue a statement and it is unclear what the suspension means for Mr McKenzie's candidacy.
The branch has been suspended following a long-running spat between Mr McKenzie and two committee members stemming from accusations that the chairman and secretary Marianne Bowness misappropriated a £1,000 donation.
An investigation found no evidence the funds had been misused but said proper procedures had not been followed.
This week the owner of the office where branch holds its meetings has barred Ukip on the advice of the police. Earlier this month HIV campaigners dumped manure outside the building in protest at comments made Ukip leader Nigel Farage.
Responding to suggestion, from a well-placed source, that he would be asked to step down as chairman and faced deselection as a candidate, Mr McKenzie insisted he retained the support of the majority of branch members and Mr Farage, who he compared this week to Jesus during an interview with ChatPolitics.
His opponents have now written to Mr McKenzie calling for an extraordinary general meeting to discuss removing him as chairman, Ms Bowness as secretary and to notify the national executive committee that the branch has no confidence in Winston as a candidate.
Mr McKenzie, who stood as an independent in the race to be Mayor of London in 2008 and finished last, has previously referred to gay couples adopting children as akin to "child abuse".
Despite the comments he finished third in the Croydon North by-election, increasing the party's share of the vote.
