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
At least 2,000 people took to the streets of Baltimore yesterday to demand answers over the death in custody of Freddie Gray
The London Marathon brings together thousands of people raising money for charity - not to mention some rather unusual costumes.
Tottenham Hotspur footballer Kyle Walker said he is "disgusted" after being wrongly linked to an explicit video being shared online.