Q: Best book on the triumphs and failures of the radical left: 1919-1948?

I am beginning to plumb the history of democratic socialism due to my increasing disenchantment with liberalism. Is there a great book(s) that covers the era from post-WWI to post-WWII, a time when progressives and radicals offered different visions for America in response to the destruction wrought by capitalism?

These are the issues I'm interested in:

Aftermath of WWI: The socialists told the populace on war's eve that Wilson was essentially a tool for the financiers and bankers: how did people react once the Left was proven right?

New Deal era: The fight between radicals like Huey Long--who sought to transmogrify the economic structure of America--and those like FDR, who merely wanted capitalism reformed.

World War II: How did the Left figure into the isolationist/inverventionist debate?

Immediate Post-War: I am interested in this five year era most of all, for this is when liberalism made an unholy union with Cold Warriorism. How significant was Henry A. Wallace's campaign against Harry Truman? How great was the struggle to stop Truman and his National Security State--which would pave the way for the end of our republic?