This is the 50s, I think it'd be pretty easy to draw a line from casual racism to white supremacists. A key difference this time is that it's not just Germans led by one insane man, it's instead a bunch of redneck prices and conspiracy theorists.
There was a lot more than that. There were Nazi sympathizers, and saboteurs, and those who plotted to overthrow the US government. People like Father Charles Coughlin reading Goebbels’ propaganda on the radio to millions of listeners and forming an anti-government militia, and legislators like US Senator Ernest Lundeen working directly with Nazis and reading speeches literally written by them.
Highly recommend Rachel Maddow’s Ultra podcast if you want to say holy shit every few minutes.
Ironically, the confederate worship started in the 50’s and 60’s during the civil rights era. It was basically a rebellion against the civil rights movement, and an attempt to intimidate black people back into silence. Like “oh you want to use the same bathroom as us now? Well you can’t stop us from erecting this statue of a confederate general, to constantly remind you where you came from.” So depending on when exactly they came from in the 50’s, the confederate stuff may also be a surprise.
I presume you're not talking about Russia? You're going to have a hard time showing them those Nazis.
A person from 1950s will just be super confused when you say it because they're going to ask you what country is Nazi. If you say the US they'll just be confused further.
We're talking about violent bigots. People responsible for mob violence against democracy, and state violence against women and minorities. Stop fucking pretending we 'just don't like it' when you try to make us less than human.