Three men have been charged with firearms trafficking and other crimes as part of the investigation into the shooting that marred a Super Bowl victory celebration in Kansas City, Mo., federal prosecutors said on Wednesday.One person was killed and more than 20 were injured in the shooting on Feb. 14, after an argument turned violent and at least six people opened fire just as the rally was dispersing near Union Station, the authorities said.Days later, two teenagers were charged with resisting arrest and “gun-related” offenses. In late February, two Missouri men, Lyndell Mays, 23, and…