When Khrushchev denounced Stalin in the 'secret speech' at Party Congress in 1956, members of the audience were so shocked that some died of heart attacks and others later committed suicide. However, the 'Khrushchev Thaw' proved something of a misnomer; the Soviet Union remained as repressive, brutal and thuggish as ever.
Questions today are whether Master Edward will do a Khrushchev and denounce Brown's foolish delusions, self deceptions, hubris and emotional illiteracy; pundits are speculating he will deride Brown's claim to have ended boom and bust and apologise for Labour's thirteen years of misrule.
Don't get your hopes up. Labour's rehabilitation of failed leaders is a long process - witness Kinnock. When ditched as party leader he behaved in the way Lembit Opik is now, and humiliated himself doing paid-for appearances on tacky Sky daytime TV quiz shows and similar. But before long, when the scars had healed a little, he was back on the podium. And so will Brown be - so Master Edward is unlikely to mouth words that will come back to haunt him.
Always make sure the knives are wielded by others is the first rule of politics.