A coup in the US in 1934? Have you heard of such a thing?

A little late night viewing had me stumble across the above video.  While it has a "History Channel" vibe to it I can't be sure if its legit.  I also can't be sure of the subject matter but it's rather compelling.  I'll do a Google search to verify if the US avoided a coup attempt in 1934 thanks to General Butler but in the meantime enjoy.