I don't really know how else to explain it. But when you see an article like "White people need to stop picking up litter: here's why that's racist" and it's written by someone named "Anna Scheissefrisser" and despite the fact that the name is a German compound noun, there's something off about it, and you look it up and sure enough, "Early life: Anna Scheissefrisser was born to an American Jewish family..."
And it's confirmed. Christian German names have a different feel than Jewish names, but why?
I deleted a section out for brevity, but the other defense mechanism until Maoism was the males of the family kept a record of descendants in a scroll, much as we used to record births in family bibles until the (((Office of Vital Statistics))), implemented through president Rosenfeld. When there was a new birth, documents would be updated, and family members could vet those who claimed to be from the family.
Obviously, impersonation is still a thing, so it isn't infallible, but this mechanism is the same one that made the jewish mafias so hard to penetrate during their heyday.
The system we were originally talking about does a good job of this.