Nightrider definitions

nīt'rī'dər
One of a secret band of mounted, usually masked white men who engaged in nocturnal terrorism for revenge or intimidation in the southern United States especially during Reconstruction.
noun
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Any of a band of masked, mounted men who perform lawless acts of violence and terror at night to intimidate and terrorize; esp., any of such a band of white men in the S U.S. after the Civil War.
noun
7
2