Doyle was a former State Commander of the Massachusetts American Legion, was at Butler and MacGuires initial meeting. Jules Archer tells us:
Morris A. Bealle, publisher of Plain Talk magazine, wrote Butler on May 24  that he had already begun ...[a veterans] organization, calling it the Iron Veterans. He urged Butler to assume its leadership: You may be interested to know that Bill Doyle tried to finance this organization for us, Bealle wrote, but acted so suspicious at Miami that I thought he was trying to take it over for the Royal Family of the American Legion, and declined to do business with him. This was the same Doyle who had accompanied MacGuire in the plotters first contact with Butler. Bealle added, A few weeks later, I discovered to my horror that [Doyle] was trying to take it over for the House of Morgan.
Source: Excerpt, Jules Archer, The Plot to Seize the White House, 1973. In Press for Conversion! magazine, Issue # 53, "Facing the Corporate Roots of American Fascism," March 2004. Published by the Coalition to Oppose the Arms Trade.
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