One of the most powerful labor organizers in American history, 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 the 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 happened to Hoffa, whether he died, where he is buried and what happened to him. Hoffa’s involvement with the mafia and as leader of the Teamsters union has made it more difficult to find him.

The wildest of claims suggest Hoffa went to South America with a go-go dancer, or that Hoffa was 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 to 1971. He was sentenced to 13 years in prison for jury tampering, but then-President Richard Nixon pardoned him in 1971 with the promise that he would not be involved in union activity.

Hoffa went 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. Reuters