The Plot to Overthrow FDR
This Documentary from The History Channel documents the plot to overthrow, by a military coup, FDR. Big businesses asked Smedley Butler (A two star General and a two time Congressional Medal of Honor recipient) to lead a 500,000 man army to do this.
This video discusses the U.S. army gassing veterans that were protesting in D.C. And killing some veterans in an attempt to disperse the protesters.
This video does have a slight spin to it (anti-gold standard).
Smedley Butler also authored "War is a Racket". This book shows the big business of war and a solution for peace.