Play video content EXCLUSIVE TMZ.com

A bunch of "Sons of Anarchy" stars say they got burned by a promoter who made off with a ton of money from people who paid to see a cast reunion -- but they rallied for their fans.

We got Rusty Coones -- Rane Quinn on 'SOA' -- returning to LAX from the disastrous event in Houston. He says the cast, including Charlie Hunnam, got duped by one of the promoters. He and co-star Kristen Renton broke it down -- saying the guy stiffed 'em with bogus paychecks.

The bigger problem -- the throngs of fans who came from around the world, forking over a total of $800k according to Rusty. Check out how they handled the messy situation.

TMZ spoke to Dave Altman, who says he worked closely with Hunnam to set up the event -- and he says the cast eventually got some dough, but nowhere close to what they were promised.