This is part of an era and culture where the creation of outlaw society in motorcycles influxed after easyrider came out. David Mann frequented with the likes of of big daddy Ed Roth and notorious Oakland members like “Tiny”. These bikes weren’t made for todays Cheeto dust society, these MF were the real deal and didn’t give a fuck who was offended. Reputation through intimidation was the M.O for most of those years and flying ⚡️⚡️ was insignia those old vets held proud. The meaning of that symbol in English is “protection squad” which relates to brothers till death.