More than a dozen suspected members of a ruthless Norteño street gang allegedly responsible for four murders, several attempted murders and assaults in San Jose are behind bars, the result of a 1 1/2-year police investigation. A five-week grand jury proceeding culminated Tuesday with indictments being issued against 13 suspected members of El Hoyo Palmas, described by police as a multi-generation gang that has operated in San Jose for about 30 years.