The Nazi party was outlawed following the war. The Nazi ideology was not stamped out. The reason why the Nazi party didn’t fight a guerilla war to maintain power was because they didn’t have to. Prominent Nazis with valuable skills were pardoned and welcomed into mainstream life (e.g. Werner von Braun became one of the lead rocket scientists for NASA). I don’t believe they even had to recant their ideology or party affiliation.

One need only watch a few far right rallies before a swastika flag or three will show up and announce that Nazism is still alive and well 80 years later.