https://collider.com/sons-of-anarchy-hells-angels/

One Hells Angel even went from suing the show to starring in it!

One of Sons of Anarchy's Best Characters Was Played by a Real Hells Angel (https://www.cbr.com/sons-of-anarchys-happy-lowman-played-by-real-hells-angel/)

David Labrava is known as Happy Lowman on Sons of Anarchy, but he's also gained fame for his past involvement in the world's largest motorcycle club.