He has brought to justice not only small-time wrongdoers – or “flies,” as Chinese President Xi Jinping’s calls such people – but also “tigers” like Senator Juan Ponce Enrile, who helped overthrow Marcos and bring Corazon Aquino to power two decades ago. As a result, the Philippines has dramatically improved its ranking in Transparency International’s annual corruption index, rising from a 134th-place tie with Nigeria in 2010, to 94th place, alongside India, last year.