This July 26, 1959 file photo shows Teamsters Union president Jimmy Hoffa in Washington. Federal agents revived the hunt for the remains of Hoffa on Monday, June 17, 2013, digging around in a suburban Detroit field where a reputed Mafia captain says the Teamsters boss' body was buried. Authorities used excavation equipment to root around in the Oakland Township property, about 25 miles north of Detroit. (AP Photo/File)