Labour has always been a divided rabble. It's the nature of the party and has been since it's genesis. Indeed it was it's raison d'etre - bringing together the many parts of the Labour Movement under one banner. For most of the party's history the left were defeated by a right leaning political elite that lead the party despite the left being overwhelmingly the majority in the party's individual membership and non-craft trade unions. When a very broad alliance of leftists began to get footholds of control in local parties and unions, the right cried foul (yet again) and some thought their own political ambitions would be served elsewhere. Kinnock brought the party 'together' by expulsion, moving to the right, cosying up to capital and ultimately throwing it all away one night in Sheffield. Ultimately this lead to the election of a Tory to lead the party and a party that is more right wing than the even the like of Frank Chapple (not Eric Chappell as I first wrote!) would have wanted.
The left persisted in the party, did all the hard work, inspired it's greatest achievements. The right used the channels of industrial, legal and political patronage to gain power and privilege and when that went sour expelled or deserted.
I would describe myself as soft left/wishy/washy liberal. I was a member of the Labour party in the 1980's and was subjected to abuse by Militant Tendency members it was extremely unpleasant. They worked hard to get their people elected and knew all the rules etc, but their aim was to turn Labour into a Trotskyist party of the far left which it never has been. I let my membership lapse.