Summary

Portrait of William Henry Moody William Henry Moody Kessler v. Eldred — Opinion of the Court

Having, then, by virtue of the judgment, the right to sell his wares freely, without hindrance from Eldred, must Kessler stand by and see that right violated, and then bring an action at law for the resulting damage, or may he prevent the infliction of the unlawful injury by proceedings in personam in equity? If Eldred succeeds in his suit against one of Kessler's customers, he will naturally bring suits against others. He may bring suits against others, whether he succeeds in one suit or not.
Source: Wikisource

Portrait of William Henry Moody William Henry Moody Kessler v. Eldred — Opinion of the Court

But the question here is whether, by bringing a suit against one of Kessler's customers, Eldred has violated the right of Kessler. The effect which may reasonably be anticipated of harassing the purchasers of Kessler's manufactures by claims for damages on account of the use of them would be to diminish Kessler's opportunities for sale. No one wishes to buy anything if with it he must buy a law suit.
Source: Wikisource

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