Juries originally were introduced into England to protect the individual from the tyranny of government. The first case in which juries nullified a law was that of William Penn and William Mead in England in 1670 The jurors refused to convict the two Quaker activists charged with unlawful assembly. The judge refused to accept a verdict other than guilty, and ordered the jurors to resume their deliberations without food or drink. When the jurors persisted in their refusal to convict, the court fined them and committed them to prison until the fines were paid. On appeal, the Court of Common Pleas ordered the jurors released, holding that they could not be punished for their verdict.
Jury nullification was introduced into America in 1735 in the trial of John Peter Zenger, Printer of The New York Weekly Journal. Zenger repeatedly attacked Governor William Cosby of New York in his journal. This was a violation of the seditious libel law, which prohibited criticism of the King or his appointed officers. The attacks became sufficient to bring Zenger to trial. He clearly was guilty of breaking the law, which held that true statements could be libelous. However Zenger's lawyer, Andrew Hamilton, addressed himself to the jury, arguing that the court's law was outmoded. Hamilton contended that falsehood was the principal thing that makes a libel. It took the jury only a few minutes to nullify the law and declare Zenger not guilty. Ever since, the truth has been a defense in libel cases.
Several state constitutions, including the Georgia Constitution of 1777 and the Pennsylvania Constitution of 1790 specifically provided that "the jury shall be judges of law, as well as fact." In Pennsylvania, Supreme Court Justice James Wilson noted, in his Philadelphia law lectures of 1790, that when "a difference in sentiment takes place between the judges and jury, with regard to a point of law,...The jury must do their duty, and their whole duty; They must decide the law as well as the fact." In 1879, the Pennsylvania Supreme Court noted that "the power of the jury to be judge of the law in criminal cases is one of the most valuable securities guaranteed by the Bill of Rights."
John Jay, the first Chief Justice of the U. S. Supreme Court stated in 1789: "The jury has the right to judge both the law as well as the fact in controversy." Samuel Chase, U. S. Supreme Court Justice and signer of the Declaration of Independence, said in 1796: "The jury has the right to determine both the law and the facts. " U. S. Supreme Court Justice Oliver Wendell Holmes said in 1902: "The jury has the power to bring a verdict in the teeth of both law and fact." Harlan F. Stone, the 12th Chief Justice of the U. S. Supreme Court, stated in 1941: "The law itself is on trial quite as much as the cause which is to be decided."