Manny Pacquiao -- Hit with Class Action Suit ... You Screwed Viewers & Gamblers (UPDATE)

4:55 PM PT -- Pissed off fans are coming out of the woodwork now -- a

in Los Angeles ... TMZ Sports has learned.

It's pretty much the same as the Nevada suit, but the plaintiffs in L.A. have included Mike Tyson as exhibit A the fight was crap. They point out Iron Mike called it "the Dud of the Century."

They're also looking for at least $5 million.

Manny Pacquiao and his fight promoters have been hit with a class action lawsuit by people who claim he screwed fans, Pay-per-view buyers and gamblers out of serious money by not disclosing his shoulder injury before the Mayweather fight.

TMZ Sports has obtained the lawsuit filed in federal court in Nevada ... in which Stephane Vanel and Kami Rahbaran are suing on behalf of a class that feel cheated.

In the suit, Vanel and Rahbaran claim they are fighting "on behalf of all persons who purchased tickets; purchased the pay-per-view event; or who wagered money on the event."

The plaintiffs are suing Pacquiao, Bob Arum, Top Rank Boxing and others for consumer fraud -- and they're demanding at least $5 MILLION in damages.