The Guardian wrote it up. The piece is useful, though, because it includes some quotes from the agencies and individuals.
FBI now classifies far-right Proud Boys as ‘extremist group’, documents say
https://www.theguardian.com/world/2018/nov/19/proud-boys-fbi-classification-extremist-group-white-nationalism-report
Did Gavin really say this?
“I love being white and I think it’s something to be very proud of, I don’t want our culture diluted. We need to close the borders now and let everyone assimilate to a Western, white, English-speaking way of life.’’ - Gavin McInnes leader of the Proud Boys
This is what the other side says proves they are white supremacists.