According to this article, many (predominantly black) voters were purged of the right to vote after mail delivered to their adress bounced, with the NAACP suing against this :
The lawsuit charges that Beaufort, Moore, and Cumberland counties are challenging voters’ eligibility with no other evidence than a single piece of mail that was sent to their home and bounced back as undelivered. [...] Arthur, who is African American and lives in a nursing home, grew up in Beaufort County and has voted in at least 14 elections. He testified that he did not receive any notice from the state or the county that his voter registration had been challenged [...]
The confusing part is this:
Shane Hubers, a Republican who ran for local office last year, challenged the registration of dozens of voters — the majority of them Democrats — in Beaufort County. In Cumberland County, a single individual used returned mail to challenge the registrations of 3,951 voters. In Moore County, N. Carol Wheeldon, the secretary of the local Republican Party, challenged approximately 400 registered voters. [...] In Moore County, Hair added, “the return address of a right-wing group called the Voter Integrity Project appeared on the piece of mail that was used to challenge voters.”
It seems like a pretty clear cut case of disenfranchising voters because they would vote "wrong". What I don't understand - From the wording, it does not appear these people (and the 'Voter Integrity Project') sent the mails in any official capacity. So why does the body organizing the election react to anybody claiming their mail to certain voters bounced? Could in theory anybody challenge anybody's voter registration in North Carolina?