Shadow foreign secretary Douglas Alexander has told Labour activists he "paid a price" for opposing former Brown aide Damian McBride's "destructive" style of politics.
Mr Alexander was hit by claims in the spin doctor's book that he ''dispassionately'' advised Gordon Brown that his sister would have to quit her role as the party's Scottish leader.
Wendy Alexander stood down from the post in 2008 following a row about donations to her leadership campaign.
Mr Alexander told the Progress rally: "What Damian McBride represented wasn't just the way politics is or just some briefing, it was destructive, divisive and deeply damaging to our party."
More top news
Lawyers for Mohammed Emwazi's father have told ITV News there's no evidence his son is IS killer 'Jihadi John' as "his face is covered".
Another cold night on the cards with freezing, frosty and for some of us icy as the temperatures slip away in the next few hours.
A three-time Yarl's Wood detainee tells ITV News about her experience at the detention centre in Bedfordshire.