Researcher seeks Hoffa grand jury records

Believing there was "prosecutorial misconduct in the case," retired law professor William L. Tabac has asked a federal judge in Nashville, Tennessee, to unseal 45-year-old grand jury records relating to legendary Teamsters leader Jimmy Hoffa, according to a story by the Associated Press.

Tabac believes the records could show that federal prosecutors and Attorney General Robert Kennedy used illegal means - including wiretaps and improper testimony - to indict Hoffa on jury-tampering charges in the early 1960s. Hoffa (right) was convicted in Chattanooga in 1964.

The former Teamsters leader was last seen in 1975, as he prepared to rejoin the union after serving time in prison. It is widely believed that Hoffa was killed by former allies in the underworld. His remains have not been found.

U.S. attorneys are opposing Tabac's request. They say witnesses need to be confident that grand jury testimony will remain secret. They also argue that Tabac has provided no substantiation for his claim that Hoffa prosecutors acted improperly.