Marcel Petiot claimed to help kill Nazi collaborators; instead, he killed those fleeing to South America with his help. | Sara B
Doctor Marcel André Félix Petiot once promised safe passage to South America to those looking to leave Nazi-occupied France, except they were never to be seen or heard from again. He was also known as Dr. Satan, the Werewolf of Paris, and the Demonic Ogre; some even referred to him as the real-life Dr. Jekyll and Mr. Hyde.
Source: newsbreak.com