Origin: formerly Lynch's law, after Capt. W. Lynch (1742-1820), member of a vigilance committee in Pittsylvania, Virginia (1780)
See lynch law in American Heritage Dictionary 4
Origin: Probably after Charles Lynch (1736-1796), American militiaman and justice of the peace who held summary extralegal trials and whippings of supposed Tory sympathizers in Virginia during the American Revolution.
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