http://en.wikipedia.org/wiki/Business_PlotRoosevelt was first inaugurated March 4, 1933. He did so much in his first 100 days that the custom of evaluating a President's first 100 days in office began with him. Besides, while running, he had promised to provide jobs for all the unemployed.
Wiki is suggesting that the business were chagrined from the campaign promise about employment, but also focuses on the gold standard bit. It indicates that discussions of toppling Roosevelt did not begin until August.
The bit about the gold standard: Congress did enact what Roosevelt wanted. The SCOTUS struck it down, but not until 1935.
http://en.wikipedia.org/wiki/Perry_v._United_States This came to my attention recently because wiki cites the case in its analysis of the 14th Amendment section on the validity of public debt, which I looked at in connection with the debt ceiling, which Boehner is again threatening not to raise.
http://en.wikipedia.org/wiki/14th_Amendment_to_the_United_States_Constitution It's possible that the Bonus Army, which marched on Washington the year before, while Hoover was still in office, brought about the idea for how a coup could be accomplished.
http://en.wikipedia.org/wiki/Bonus_armyEisenhower and MacArthur dealt harshly with the WWI vets. Supposedly, that was of their own accord. Supposedly, Hoover had only asked them to keep order or something. I heard that on PBS. Sounded like RW bullshit to me.
Eisenhower and Prescott Bush
Eisenhower and George Herbert Walker Bush