Socialist Workers' Party conference over sex claims
The Socialist Workers' Party has been criticised by some of its members over its handling of a rape allegation.
The crisis that has followed has led some on the left to question the existence of the party, with a special conference to address the issue this weekend.
Adam Fleming reports on the party's history and present troubles.
Watch more clips of films and interviews; 'like' us on our Facebook page; watch the Sunday Interviews with Andrew Neil, follow us on Twitter or watch programmes from the last seven days on BBC iPlayer