Megan Keller, The Hill, November 19, 2018

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“The FBI categorizes the Proud Boys to be an extremist group with ties to white nationalism,” wrote Commander Michael McCabe, author of the document that was completed Aug. 10.

McCabe, who runs internal affairs, training, background investigation and courthouse security for the Clark County Sheriff’s Office in Vancouver, Wash., confirmed the document’s authenticity to The Guardian in an article published Monday.

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The FBI said they “have been warning [local law enforcement] for a while” about the Proud Boys, McCabe told The Guardian.

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Facebook is also banning accounts associated with the Proud Boys.