Sean, just the nonsense I've come to expect from you.
You twist the issue of personal enemies working together, to the point of leaving themselves at the mercy of those enemies, to the one of mere business rivals with no personal animosities working together.
You make the laughable claim that if a plot was revealed prematurely FDR or perhaps J Edgar Hoover, no friend of civil liberties, could take no action if they found the evidence provided by someone on the inside credible.
Since you claimed Butler ceased his efforts for prohibition in Pennsylvania because his leave from the army had expired my comment on which branch of the service he served in was entirely legitimate.
You confused the Liberty Lobby, formed in 1955, with a completely different group called the Liberty League. Another factual error.
Businessmen, or anyone else, supporting political groups financially is entirely legal, whether you like their positions or not. And, of course, you offer no evidence that either funding of or actions taken by the Liberty League were illegal.
The core of the plot was supposedly to be based on a veteran's march on Washington DC yet somehow no one involved appear aware of the actual and infamous affair of the Bonus Expeditionary Force a few years earlier. Which is utterly non-credible.
Another bit of stupidity is, again, proponents of a right-wing coup somehow being unaware of Butler's outspoken political positions on the other end of the spectrum. If you can imagine a left wing conspiracy asking MacArthur to lead the effort then this might be believable...
The committee's sole evidence was the actual postcards sent to Butler by Gerald MacGuire. Neither he nor anyone else was ever charged with a crime, let alone convicted, this at a time when the government's power to take action against perceived criminals was subject to far fewer limits, which certainly damages the claim that any credible evidence was found which could stand up in a court of law.
Sorry to drag you back to this time line.
RCAF Brat, not to mention that the co-chair of the committee, who is the key 'source' of the 'material' discovered years or decades later, was Samuel Dickstein, a proven agent of Joseph Stalin.