http://home.iprimus.com.au/korob/fdtcards/Butler.htm<snip>
Butler had friends in the press and Congress, so he could not be ignored when he came forward in late 1934 with a tale of conspiracy against President Roosevelt, in which he had been asked to take a leading role. At first glance, Butler seems an unlikely candidate for such a position. While Butler was a Republican, in 1932 he campaigned for Roosevelt, calling himself a "Republican-for-Ex-President Hoover." (Butler had a poor relationship with Hoover going back to their time together during the Boxer Rebellion.)
But there were good reasons why someone seeking to overthrow the U.S. government would have wanted Butler involved. Butler was a powerful symbol to many American soldiers and veterans - an enlisted man's general, one that spoke out for their interests while on active duty, and after retirement. Butler would have attracted men to his cause that would not otherwise have participated in a march on Washington.
Butler would have been a good choice also because of his military skills. His personal courage and tactical skill would have made him a powerful commander of an irregular army. Finally, his ties of friendship to many officers still on active duty might have undermined military opposition to his force, as friends and colleagues sought to avoid a direct confrontation with him.
Another reason that the plotters might have approached such an unlikely candidate was that Butler was not regarded as a great intellect. After World War I, the Marine Corps had began to emphasize a new college-educated professionalism. Butler, one of the less educated "bushwhacer" generals, might have seemed easy to manipulate.
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Needless to say, the coup plot evaporated. For you lurking "spook types", I am NOT advocating anything illegal, so relax.
http://en.wikipedia.org/wiki/Smedley_Butler