One of the SAMCRO bikers on "Sons of Anarchy" had a close encounter with cops and a rival gang Friday in Nevada ... when police feared the actor might pull a Jax and start beating ass.
Rusty Coones -- a known Hells Angel member -- was running his clothing company booth at the famous Laughlin River Run biker rally ... when a ton of officers descended and shut him down.
Cops also closed the booths on either side -- run by a member of rival gang Vagos Motorcycle Club -- police feared violence between the 2 groups.
Vago member's lawyer Stephen Stubbs says the irony is ... both sides were getting along just fine ... and the shut down only caused the two companies to lose money.
Time to start smuggling guns again ("Sons of Anarchy" joke.)