One of the most powerful labor organizers in the U.S., Jimmy Hoffa, disappeared in 1975, and now investigators are hunting for his body again, the FBI confirmed Friday.

Current investigations led the FBI to a New Jersey landfill in October, according to the New York Times.

“Last month, the FBI obtained a search warrant to conduct a site survey underneath the Pulaski Skyway," Special Agent Mara Schneider of the FBI's Detroit field office said, according to BBC. "That data is currently being analyzed. Because the affidavit in support of the search warrant was sealed by the court, we are unable to provide any additional information.”

There have been multiple rumors, conspiracies, and reports about what actually happened to Hoffa, whether he died, where he is buried, and what exactly happened to him. Hoffa’s involvement in the U.S., mafia, and as leader of the Teamsters union has only made it more difficult to find him. There was a turbulent relationship between Hoffa, the union, and the mafia.

The wildest of claims suggest Hoffa disappeared and went off to South America in the company of a gogo dancer, or that Hoffa is buried underneath the New York Giants football stadium. There is no evidence that completely supports any claim or report that has come out about what happened to Hoffa.

Hoffa was the leader of the International Brotherhood of Teamsters from 1958 until 1971. He later began to serve a 13-year sentence behind bars in 1976 for jury tampering until Nixon pardoned him in 1971 with the promise that he would not be involved in union activity. Four years later, Hoffa would go missing on July 30, 1975, in Michigan, never to be seen again. Hoffa's son now serves as the Teamsters union General President.

The story and legend of Hoffa went on to inspire the movie, “The Irishman” starring Robert De Niro, playing truck driver Frank Sheeran, and Al Pacino, who plays Hoffa.

Teamsters General President James Hoffa Jr.

Teamsters General President James Hoffa Jr. Photo: Reuters