Crossing Hoffa

On a spring day in 1961, over-the-road trucker Jim Harper was en route from Mauston, Wisconsin, to his home in Minneapolis. At 70 miles per hour, with a combined 60,000 pounds of man, machine, and material, he approached a curve along the Great River Road and hit the brakes. The tractor-trailer didn't slow. Harper's brake lines had been cut.

In preceding months, Harper had led an insurgency in his ...