King Coal by Upton Sinclair

They went out by the rear door of the office, entered the car, and sped out of the village, unseen by the crowd. And all the way down the canyon Edward pleaded with Hal to drop the controversy and come home at once. He brought up the tragic question of Dad again; when that did not avail, he began to threaten. Suppose Hal's money-resources were to be cut off, suppose he were to find himself left out of his father's will -- what would he do then? Hal answered, without a smile, "I can always get a job as organiser for the United Mine-Workers."

So Edward gave up that line of attack. "If you won't come," he declared, "I'm going to stay by you till you do!"