11 members of Southern California gang tied to killing of two police officers arrested on federal charges

Gang has about 40 members and ties to Mexican Mafia.
Main suspect originally targeted someone else but ended up killing a woman.
Gang member who killed two police officers had avoided prison before due to district attorney's directive.
Gang accused of illegal gambling, selling methamphetamine, and other violent crimes.
Investigation into gang began after member killed two police officers in June.