Seriously, nazis of any description are not a problem at all on any well-run website. We ban a few every month, it's nothing, they're easy to spot, they don't even register as an issue, I've instance-blocked a few here on Fedi just while writing this thread.
As a community manager, you don't need to worry about nazis unless you're managing a nazi website, and if you are then you're probably not reading this thread.
Abusers are hard to spot and hard to ban. Nazis are easy.