Definition
Misprision of treason is the offense of knowing that an act of treason has been committed and deliberately concealing that knowledge from the proper authorities, without having participated in or consented to the treasonous act itself. The concealment — not mere silence — is the gravamen of the offense. A person who witnesses or learns of treasonous conduct and actively suppresses or withholds that information from the government commits misprision of treason, even though they took no part in the underlying plot.
The offense occupies a distinct legal space: it is neither treason nor mere complicity. It targets the person who stands apart from the crime but shields it from detection.
Common Confusion
Misprision of treason is frequently confused with two adjacent concepts. First, it is not the same as being an accessory to treason — an accessory aids, abets, or assists the treasonous act itself, while the misprisant does none of these things. The misprisant's wrong is purely one of omission coupled with concealment. Second, misprision of treason should be distinguished from misprision of felony, a broader (and historically separate) offense covering concealment of felonies generally. The two share structural logic but differ in severity, elements, and historical treatment. Conflating them in historical sources can produce research errors, particularly in older English materials where "misprision" was used loosely across several related offenses.
Core Elements
The offense traditionally requires three elements working together:
1. Knowledge. The defendant must have actual knowledge that treason has been committed or is being planned. Mere suspicion is insufficient.
2. Concealment. The defendant must have taken some affirmative step to conceal the treason — by silence alone, some jurisdictions and commentators historically debated whether liability attached, though the weight of authority treats deliberate, continued concealment as sufficient.
3. Absence of participation. If the defendant aided, encouraged, or consented to the treason, they become a principal or accessory, not a misprisant. Misprision requires that the defendant's only wrong is the concealment, not the underlying act.
Why It Matters in Research
This term is a structural pattern of historical evolution. Several research traps apply.
First, the offense has ancient English roots and appears prominently in pre-Revolutionary colonial law and early American statutory material. Researchers working in early American or colonial sources will encounter misprision of treason treated as a serious standalone felony — often with severe penalties — rather than as a secondary or derivative offense. Do not read modern minimization of the offense back into historical sources.
Second, the English common law tradition treated misprision offenses as a broad category covering a range of neglect-of-duty and concealment wrongs. When historical dictionaries or treatises use "misprision" without qualification, the researcher must determine whether treason, felony, or some other variant is meant. Black's entry cites the California Penal Code (§ 38) as its operative source, which signals that by the time of that edition, the offense was being codified with more precision — a useful marker for tracking statutory modernization in your corpus.
Third, federal law in the United States carries a separate codified offense of misprision of felony (18 U.S.C. § 4), but misprision of treason as a distinct federal crime has received comparatively sparse modern development. Researchers searching federal case law will find thin doctrine; the historical record is far richer than the modern one.
Fourth, corpus researchers should note the word "misprision" appearing in contexts wholly unrelated to treason or felony — in equity and ecclesiastical practice, "misprision" sometimes meant mistake or clerical error. Context is essential to avoid misclassification.
Historical Dictionary Support
Black's Law Dictionary provides a compact but accurate core definition: "the knowledge and concealment of treason, without otherwise assenting to or participating in the crime," anchoring to California Penal Code § 38. This formulation aligns with the classical common law understanding and reflects the offense's essential structure: knowledge plus concealment minus participation.
What Black's does not do is capture the historical severity of the offense or its evolution from the English Treason Acts. In early English law, misprision of treason was punishable by forfeiture of lands and goods and imprisonment for life — a severe sanction reflecting how seriously the Crown treated any protection of traitors. That context is entirely absent from Black's codified citation, which presents a compressed, modernized version.
Historical sources also diverge on whether bare silence — without any overt act of concealment — could satisfy the offense. English commentators, including Blackstone, treated the concealment requirement as met by a failure to disclose to the authorities within a reasonable time. American jurisdictions codifying the offense tended toward requiring something more active, though the line was rarely drawn with precision.
Jurisdictional Note
Misprision of treason has largely faded as a prosecuted offense in American jurisdictions, though it remains on the books in some state codes. English law abolished the distinct offense of misprision of treason by statute (Criminal Law Act 1967), absorbing its conduct into broader inchoate and accessory frameworks. Researchers working across Anglo-American sources should verify the applicable jurisdiction and era carefully before assuming parallel treatment.