Definition of infamous crime
: a crime judged infamous because it constitutes treason or a felony, because it involves moral turpitude of a nature that creates a strong presumption that the one guilty is unworthy of belief in a court of law, or because it subjects the one guilty to infamy no person shall be held to answer for a capital or otherwise infamous crime, unless on a presentment or indictment of a grand jury, except in cases arising in the land or naval forces, or in the militia, when in actual service in time of war or public danger — U.S. Constitution
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