On October 25, 1988, the British television program The Men Who Killed Kennedy named Sarti as one of three French gangsters involved in the assassination of John F. Kennedy. According to the program, Sarti, Roger Bocagnani, and Sauveur Pironti were contracted by organized crime in the United States. In the French newspaper Le Provençal, Pironti denied the allegation stating he believed at the time of the assassination that Sarti was held in Marseille's Baumettes Prison and that Bocagnani was in Bordeaux's Fort du Hâ.
After the death of E. Howard Hunt in 2007, Howard St. John Hunt and David Hunt stated that their father had recorded several claims about himself and others being involved in a conspiracy to assassinate John F. Kennedy. In the April 5, 2007 issue of Rolling Stone, Howard St. John Hunt detailed a number of individuals purported to be implicated by his father including Sarti, as well as Lyndon B. Johnson, Cord Meyer, David Phillips, Frank Sturgis, David Morales, and William Harvey. The two sons alleged that their father cut the information from his memoirs, "American Spy: My Secret History in the CIA, Watergate and Beyond", to avoid possible perjury charges. According to Hunt's widow and other children, the two sons took advantage of Hunt's loss of lucidity by coaching and exploiting him for financial gain. The Los Angeles Times said they examined the materials offered by the sons to support the story and found them to be "inconclusive".