Latin sensation Gloria Trevi's security guards allegedly beat the crap out of a spectator at a recent concert in L.A. ... humiliating him in front of 4,000 people ... and now, the guy's suing for $1 MILLION.
The spectator -- a guy named Elvis Navarro -- filed the lawsuit in L.A. County Superior Court, claiming he attended a Trevi concert on May 11th at Nokia Theater ... and was assaulted, battered, pushed to the ground, and handcuffed by Gloria's security team.
Elvis doesn't explain what, if anything, provoked the guards -- but claims the entire incident took place in front of 4,000 people ... "causing [him] mental and physical injuries."
Elvis isn't messing around either. He wants $1,000,000 in damages.
Calls to Gloria's camp were not returned.