Well I don't want to be rude, so don't take this the wrong way, but having a BA & MA in history, predominately Australian hsitory, not to mention I was doing a PhD about the Whitlam Dismissal (prior to falling seriously ill so alas I never got the chance to finish it), gives me some academic authority to make an informed opinion. But if you want sources, well just grab a couple of Australian History books.
DMA, I don't doubt that you have a passion for Oz history, and you probably have more texts at hand than I do, but of the list below I have read Daly and McMullin--and they're both Chifley loyalists who would strongly disagree with the idea of an _electorally significant_ union backlash in 1949 (okay, not Fred, he's passed on.)
Just guessing, but I imagine you see the prosecution of the communist strike leaders on NSW's coalfields during Chif's last term as something of a 'great betrayal'. If that's the case then you're onto something--many leftwing unionists were quite bitter about that, not to mention the use of troops and 'reffos' as 'scabs'.
However, if you want insight into how leftwing unionists held conflicting views about that government--anger at some actions, yet strong support for many other policies--you should read Clyde Cameron's memoirs (rightly or wrongly Cameron, who only died the other day, has become _the_ leftwing primary source for the Chifley years, even if he only served in opposition with the great man.)
If it's just your opinion that the Curtin and Chifley goverments were engaged in political apostasy, then fine. That's entirely subjective. It's your right to think that.
But I don't see how you can legitimately argue that that was either the popular opinion in 1949 or the opinion of mainstream history written since then that analyses the reasons for that year's federal election results.
(Revisionist history, and the merits thereof, is another matter.)
Anyway, I think we should just agree to disagree.
I know I feel guilty for helping to hijack a thread that was originally about something or other... Churchill?
Here's a basic a list of my sources which I own...
General Histories
Bolton, G.
The Oxford History of Australia: The Middle Way 1942-1988, Melbourne, 1990
Clarke, M. A Short History of Australia, Fourth Edition, Ringwood, 1995
Crowley, F. (Ed),
A New History of Australia, Melbourne, 1974
Molony, J.
History of Australia, Ringwood, 1988
Specialist Histories
Alexander, F.
From Curtain To Menzies and after, Melbourne, 1973
Daly, F.
From Curtin To Kerr, South Melbourne, 1977.
McKinlay, B.
The ALP: A Short History of the Australian Lanor Party, Richmond, 1981
McMullin, R.
The Light On The Hill, Melbourne, 1991
IIRC it was Communist preferences which decided the OTL 1949 election.