Where it all started:

 "When in this age of ours when revolution walks like a destroying angel among the nations of the earth and breathes death from its nostrils among the peaceful inhabitants thereof; when the rulers upon their thrones are unsafe; when in this very land of liberty, calling itself Protestant, a Booth strikes down the most peaceful of men, the kindly Lincoln; a Guiteau destroys the useful life of a Garfield; when at the dawn of the twentieth century a ruler chosen by his fellow citizens is murdered by the hands of the assassin Czolgosz while enjoying the quiet hospitality of a sovereign state; and when you ask for the reason that produced such murderous outrages, we bid you turn to Luther and his rebellious teachings announced and embodied in the work falsely styled "Reformation"  producing the result of a deformation. Luther is its father, the sixteenth century its cradle, and autocracy its protector and high priest."

The Facts about Luther