The feds say the suspects are members of the Rollin' 30s Crips, and each is charged with conspiracy to interfere with commerce by robbery for the violence that broke out at the restaurant back on March 4.
TMZ broke the story ... the armed robbery went down in broad daylight with the shooter and 2 accomplices going after a $500,000 Richard Mille watch a man was wearing. During the incident, a bystander ended up getting shot in the leg.
Additionally, the feds say the victim wearing the watch was held at gunpoint. During the struggle for the watch, the gunman fired 2 shots -- one of which hit the woman who was sitting nearby.
According to the feds, one of the alleged gang members' DNA was found on the robbery victim's clothing, and surveillance footage all 3 scouting the area before the robbery. Bev Hills cops, Santa Monica PD and the FBI teamed up to make the arrests.
The suspects face up to 20 years in federal prison, if convicted.