"Jock's hand reached back from the grave and caught his own killers." The words were those of the attorney for Joseph ("Jock") Yablonski, slain insurgent candidate for the leadership of the United Mine Workers Union. They fairly characterized the capture of three suspects in the murder. Yablonski, 59, had spent the last few weeks of his life in steadily mounting terror. Fearing assassination, he began keeping a gun at his bedside, installed floodlights outside his secluded Clarksville, Pa., home, and kept a list of license-plate numbers of unfamiliar cars in the area.
One of the cars belonged to a Cleveland...