Notoriously, Voignier used the connections he made as an undercover operative to participate in the criminal underworld while also investigating it - but some historians suggest this was part of a deception invented by the FBI in 1951.

[5] Around this time, Voignier met a French-Italian gangster named Francois Spirito, who had started his own gang in Marseilles at the age of 14 and would become the "father of modern heroin trafficking".

[3] During this time, Voignier first met agents of the Federal Bureau of Narcotics (FBN) which had been tasked by Harry J. Anslinger to the ranks of the COI and OSS for the duration of the war.

Williams enrolled Voignier in the program at the Military Intelligence Training Center at Camp Ritchie, where he became an expert in close quarter infiltration, disguise, and silent killing.

[5] Sometime in the 1930s or '40s, while operating in the criminal underworld of the Italian mafia in the US, Voignier was also approached by agents of the Federal Bureau of Investigation (FBI) to assist the agency in tracking down stolen art, going undercover with the alias "Gus Manoliti.

[7][3] At this time, the federal government created a backstop cover story for Jean Pierre LaFitte - writing that the year 1951 was his first immigration to American soil.

White wrote the following in a letter to Williams in 1975: "how absolutely amazing it is that every one and their brother has swallowed hook-line-and-sinker the myth of Lafitte's arrival here ... if I didn't know that he'd been around since before they invented iced tea I'd probably believe it myself.

After Olson had consumed a quantity of alcohol and nembutal, in a drunk and high state, he got into a tussle with Voignier and Spirito, and wound up falling out of the window to his death.

In 1954, nine months after Olson's death, Voignier was sent to Las Vegas by Hank Greenspun at the suggestion of Ed Reid, an employee of Millard Preston Goodfellow's old newspaper, the Brooklyn Eagle, to investigate a brothel called "Roxies," and the corrupt Sheriff who owned it.

[5] In 1969, Voignier's alias Pierre LaFitte was arrested by the FBI in New Orleans where he was working as the head chef of the Plimsoll Club and jailed in Boston, facing charges of diamond smuggling - after the investor Ralph Loomis was swindled of $400,000.

[4] His life in undercover work as Pierre LaFitte was over due to the great publicity of his arrest - however, Loomis had died the year earlier, so the trial could not take place.