On 6 April 1917 the US declared war on Germany but...
...later that same year 7 months and 8 days later a different war began. This different war was really one sided.
https://en.wikipedia.org/wiki/Silent_Sentinels#Occoquan_Workhouse_and_the_Night_of_Terror
On the night of November 14, 1917, known as the "Night of Terror", the superintendent of the Occoquan Workhouse, W.H. Whittaker, ordered the nearly forty guards to brutalize the suffragists. They beat Lucy Burns, chained her hands to the cell bars above her head, then left her there for the night. They threw Dora Lewis into a dark cell and smashed her head against an iron bed, which knocked her out. Her cellmate, Alice Cosu, who believed Lewis to be dead, suffered a heart attack. Guards grabbed, dragged, beat, choked, pinched, and kicked other women.
When I think of political prisons I usual remember names like the Soviet Karlag or Insein Prison in Burma. About 15 years ago I drove past this sign 5 days a week on the way to work:
That place houses a museum now:
https://goo.gl/maps/5EGLafHdkXE2
What kind of thing might it take today for someone to be considered an enemy of the state?