I'd make several assumptions:

1) It's possible for humans to act like Nazis 2) It's possible for a democratic state to gradually become not only a host to Nazis, but become a host that's run by Nazis 3) At an early stage, many people can't distinguish between Nazis as a positive or benign force and Nazis as, well, Nazis.

So, perhaps I could use some tips. What would acting like Nazis look like?

They'd crush the unions to undermine their political opponents.

They'd align themselves with big business.

They'd tell "big lies" and believe that if they repeat them enough then people would believe them.

They'd think a minority religion was plotting their downfall and start making plans to deport them all.

They'd build up the army, while not spending enough on problems at home.

Against all economic advice they'd stop trading with others, viewing it as weakness, and try to become entirely self-sufficient.

So watch out for that kind of thing.