New Delhi, July 2 -- Gabriel Garcia Luna, Guatemala's new attorney general who took office in May, pledged Wednesday to dismantle what he called the "repressive and vengeful" administration of his predecessor, who was sanctioned by multiple countries including the U.S. for stifling anti-corruption efforts.

Guatemala, once a strong U.S. partner in the region on anti-corruption efforts, took a turn under Consuelo Porras, who stifled corruption cases, persecuted justice officials, activists and journalists, and drove many into exile. She also attempted to prevent President Bernardo Arevalo's inauguration and invalidate his presidency by alleging fraud, which was never proven.

"Everyone has a concept of a Public Prosecutor's Office that can...