The North Carolina chapter of the NAACP has called on state and federal authorities to investigate what the group considers racial and witness intimidation.
NAACP leaders cite a mass mailing from a Virginia-based white supremacist group that criticizes the charges filed against Anthony Dale Finch. He's a former Henderson Police officer accused of ethnic intimidation, pointing a gun and communicating threats.
The letters use derogatory terms to ask "white workers" to rise up against black crime.
State NAACP president William Barber says the letters are a form of witness intimidation.
A spokeswoman for the S-B-I says the agency is trying to gather information about the letters.