I wonder... Hitler should have declared the culture of the Nazis a religion. Then, they would have been protected in the USA.
I’d like to see a national movement to declare Islam either a political movement, or a cult. And, then we’d ban that party or cult from the society of our nation.
The Bund was protected in the USA, that was until we entered WWII.
After that, if you sided with the Japanese government, German government, or Italian government, you were considered to be siding with the enemy in a time of war.
We only prosecuted a handful of people for treason after WWII but there were more who were held and certainly there were acts of sabotage, espionage, and recruiting.